200% Deposit Bonus Casinos UK: How They Work, What They Cost You

A 200% deposit bonus doubles your money on paper. Put in £20, play with £60. That is the pitch, and it is a good one. The catch sits in the terms, and the terms vary wildly between operators. Some UK-licensed sites attach 40x wagering to the bonus only. Others apply 65x to bonus plus deposit and cap your winnings on top.

This guide breaks down how 200% matched deposit offers actually work across the UK market in 2026, which brands still run them, what the realistic cost of clearing one looks like, and how the UK Gambling Commission's tightening of bonus rules has reshaped the product itself. Lobby design, payment flows, even the order of the buttons on a cashier screen are all downstream of regulation now.

What Is a 200% Deposit Bonus and Who Offers Them in the UK?

A 200% deposit bonus means the operator matches your deposit at twice its value in bonus funds. Deposit £10, receive £20 in bonus credit. The total playable balance becomes £30, though the bonus portion almost always carries wagering conditions before it converts to withdrawable cash. That distinction matters more than the headline percentage.

In the UK, 200% offers are less common than they were five years ago. The Gambling Commission's 2020 ban on credit card gambling and the 2023 tightening of bonus terms pushed operators toward smaller, cleaner welcome packages. A £10 deposit for £30 in total credit is now the standard shape of a 200% deal, not the £200-for-£600 monsters of the pre-2018 era.

Where you still find them: bingo-first brands, casino sites targeting low-stakes players, and a handful of slots-focused operators. The brands below are the ones running 200% structures or close equivalents as of early 2026.

Which UK Operators Currently Run 200% Deposit Bonuses?

The list shifts monthly as promotions rotate, but the following operators have consistently offered 200% matched structures or their nearest equivalent over the past 12 months. All hold UK Gambling Commission licences unless noted.

Notice the pattern. Pure 200% offers cluster around bingo brands, where the average stake is lower and the bonus pool is smaller. Casino-first operators have largely settled on 100% up to £50–£100. The 150% tier at 32Red is the closest a mainstream casino brand gets to a true 200% structure.

Offshore operators do offer genuine 200% casino bonuses with bigger caps, but they sit outside UKGC jurisdiction. If you play on one, you lose access to UK dispute resolution, the national self-exclusion scheme GAMSTOP, and the Financial Ombudsman route. That is a real trade, not a marketing line.

Why Do 200% Bonuses Cluster Around Bingo and Slots?

Bingo economics explain it. A bingo room works on thin margins and high volume, so operators can afford to hand out larger bonus ratios because the house edge on 90-ball bingo sits around 20–30% depending on ticket pricing and player numbers. Slots sit at 2–6% house edge on most UK-licensed titles, which means a bonus on slots takes far longer to clear and carries more risk to the operator.

Pragmatic Play, NetEnt and Microgaming titles dominate the slots side, with RTPs typically between 94% and 96.5%. Evolution runs most live dealer product. Those RTP figures directly affect how much of a 40x wagering requirement you can realistically survive, which we will get to.

Bingo also benefits from a different bonus model. Many bingo brands credit bonus as bingo credit rather than cash, limiting it to specific rooms. That restricts the bonus to a product with a known, stable house edge, which is why the 200% number survives there while it has largely died in casino.

How to Clear a 200% Deposit Bonus: The Real Maths

Wagering requirements decide whether a bonus is worth taking. A 200% bonus with 40x wagering on the bonus alone is a different animal from 40x on bonus plus deposit. The second doubles your effective requirement and is the single most common trap in UK bonus terms.

Run the numbers on a typical offer. Deposit £10, get £20 bonus, total balance £30. At 40x bonus only, you need £800 in qualifying stakes. At 40x bonus plus deposit, you need £1,200. Same headline, 50% more work. That gap is where most players get caught out.

Then comes game weighting. Slots usually contribute 100% toward wagering. Live dealer tables often contribute 10%. Some progressive jackpot slots contribute 0%. If your favourite game sits at 10%, your £800 requirement becomes £8,000 in real stakes. Always check the weighting table before you deposit, not after.

What Does a 200% Bonus Actually Cost You in Expected Value?

Expected value is the honest way to judge any bonus. Take a £10 deposit, £20 bonus, 40x wagering on bonus only, playing a slot with 96% RTP. You must stake £800. At 96% RTP, you expect to lose 4% of £800, which is £32. Your bonus was £20. So the bonus is worth roughly minus £12 in expectation before you factor in the deposit.

Now swap in a 94% RTP slot. The expected loss on £800 becomes £48. The bonus is now worth minus £28. That single 2% RTP difference costs you £16 across the same wagering volume. This is why game choice during clearing matters more than the bonus size itself.

Bingo changes the maths entirely. At a 25% house edge on £800 in bingo stakes, expected loss is £200. No 200% bonus survives that. Bingo bonuses work because the stake sizes are smaller and the bonus is often locked to specific rooms with fixed prize pools, effectively subsidising the operator's marketing spend rather than offering genuine value to the player.

The practical rule: a 200% bonus is only worth clearing on slots with RTP above 96% and wagering at 40x or below on bonus only. Anything else and you are paying for the privilege.

Which Games Count Toward Wagering Requirements?

Game weighting is buried in the terms and varies by operator. The table below shows typical weighting across mainstream UK casino brands in 2026.

The 10% weighting on live dealer is the most common source of complaints to UK dispute services. Players deposit for a 200% bonus, head straight to Evolution's Lightning Roulette, and wonder why their balance never converts. It never will. Stick to slots if clearing is the goal.

Hacksaw Gaming titles have become popular for clearing because they combine high volatility with competitive RTPs, often in the 96% range. The trade-off is variance. You may clear the bonus quickly or bust in 20 spins. Pragmatic's Gates of Olympus and Sweet Bonanza sit at 96.5% and 96.5% respectively, which is why they appear in most bonus-clearing strategies.

What Time Limits Apply to 200% Deposit Bonuses?

Most UK operators give you 7 to 30 days to clear a welcome bonus. Gala Bingo and Foxy Bingo typically allow 7 days on the bonus portion. JackpotJoy runs 30 days on some promotions. Casumo allows 30 days. LeoVegas gives 21 days. The variance is significant and rarely advertised prominently.

Miss the deadline and the bonus and any winnings derived from it are removed. That is standard. The clock usually starts at the moment of deposit, not the first spin. If you deposit on a Friday and do not play until Sunday, you have already burned two days.

Free spins attached to a 200% offer often carry a shorter window. 24 to 72 hours is common. Read the spin terms separately from the bonus terms. They are frequently governed by different conditions, including different wagering and different expiry.

UK Regulation and How It Shapes Bonus Design

The Gambling Commission has reshaped bonus product more than any single operator decision in the past decade. Rules introduced from October 2020 and tightened through 2023 and 2024 now govern how bonuses can be advertised, how terms must be presented, and what counts as a fair and transparent offer.

Key requirements: bonus terms must be available before deposit, not buried in a linked page. Significant conditions must appear alongside the headline claim. Wagering requirements must be stated as a multiple, not an abstract phrase. Operators cannot describe a bonus as "free" if it requires a deposit or wagering to withdraw. Fines for breaches have run from £100,000 to over £10 million depending on severity.

That regulatory pressure explains the shift away from headline 200% offers. A 200% bonus with 65x wagering on bonus plus deposit is harder to advertise compliantly than a 100% bonus with 30x on bonus only. The simpler product is easier to explain, easier to defend, and less likely to draw a regulatory letter.

Which UK Operators Have Been Fined Over Bonus Terms?

Several household names have paid eight-figure settlements for bonus-related failings. The pattern is consistent: unclear terms, slow removal of unfair conditions, inadequate interaction with at-risk customers who were chasing bonus requirements.

In 2022, 888 UK Limited paid £9.4 million for social responsibility and anti-money laundering failures, some of which touched bonus promotion. In 2023, William Hill paid £19.2 million for similar breaches. In 2024, several mid-tier operators received six-figure penalties for bonus terms that failed the fairness test. The Commission has been explicit that bonus design is a regulatory issue, not a marketing one.

The practical effect for players: terms are now clearer than they were in 2018, but bonuses are smaller. You trade headline value for legibility. Whether that is a good deal depends on what you actually want from the bonus.

How Does GAMSTOP Affect Bonus Eligibility?

GAMSTOP is the UK's national online self-exclusion scheme. Register once and you are blocked from every UK-licensed operator for a minimum of 6 months, extendable to 5 years. It is free, and it is the single most effective tool available to UK players who need a hard stop.

If you are on GAMSTOP, you cannot claim a 200% bonus at any UK-licensed site. Operators must check the register before allowing play. Attempting to circumvent GAMSTOP by using a different email or a VPN is a licence breach for the operator if they fail to catch it, but it also voids any winnings you accumulate. There is no version of this that ends well.

For players not on GAMSTOP but concerned about bonus chasing, most UK operators offer deposit limits, loss limits, session reminders and time-outs. These are separate from self-exclusion and can be set for 24 hours, 7 days, 30 days or longer. They apply immediately and cannot be reversed during the set period.

Top UK Operators: 200% Bonuses and the Closest Alternatives

Not every brand on the list runs a literal 200% offer, but the ones below are the most relevant to UK players comparing bonus value in 2026. Each entry covers what the operator actually offers, what the wagering looks like, and where it sits in the market.

Gala Bingo

Gala Bingo's welcome offer has sat at 200% up to £40 plus 50 free spins for much of the past two years. Wagering is 40x on the bonus, with bingo credit and slots credit treated separately. The bingo side is the stronger half of the offer. Slots clearing is possible but tighter. Owned by Entain, UKGC licensed, part of the same group as Ladbrokes and Coral.

Foxy Bingo

Foxy runs 200% up to £30 with a £10 minimum deposit. The bonus is bingo credit, which restricts it to bingo rooms. Wagering sits at 40x. Foxy's brand identity is aimed at a specific demographic, and the bonus reflects that: modest headline, clear terms, no casino crossover. UKGC licensed, part of the Entain portfolio alongside Gala.

Sun Bingo

Sun Bingo offers 200% up to £50, one of the larger caps in the bingo segment. Wagering is 45x on the bonus, slightly above the segment average. The site runs on Playtech's bingo platform and carries a mix of bingo rooms and slots. UKGC licensed, operated under the News UK umbrella via a partnership with Playtech.

JackpotJoy

JackpotJoy's 200% up to £50 offer is one of the more generous structures still running. Wagering is 40x on the bonus. The site runs bingo and slots, with a games lobby that leans heavily on Pragmatic and NetEnt titles. UKGC licensed, part of the Gamesys/Bally's group.

MrQ

MrQ does not run a literal 200% cash bonus. Instead, it credits 200% of your deposit as free spins value, with zero wagering on the spin winnings. Deposit £10, get £20 in spins, keep what you win. That structure is arguably better than a 200% cash bonus with 40x wagering, because there is no clearing requirement. UKGC licensed, independent operator.

PlayOJO

PlayOJO takes the no-wagering model further. Its welcome offer credits free spins with 0x wagering, meaning any winnings are immediately withdrawable. It is not a 200% bonus in the traditional sense, but the effective value often beats a 200% offer with 40x terms. UKGC licensed, part of the SkillOnNet group.

32Red

32Red runs a 150% up to £150 welcome bonus, the closest mainstream casino brand gets to 200%. Wagering is 40x on the bonus. The site has a long-standing reputation for Microgaming and NetEnt content, with a strong live dealer section powered by Evolution. UKGC licensed, part of the Kindred group.

Casumo

Casumo offers 100% up to £300 plus 50 spins on first deposit. The headline is lower than 200% but the cap is higher. Wagering is 30x on the bonus, one of the lowest in the market, which materially improves the expected value. UKGC licensed, independent operator with a strong slots lobby.

LeoVegas

LeoVegas runs 100% up to £100 plus 50 spins. Wagering is 35x on the bonus. The site is mobile-first, with a lobby heavily weighted toward Pragmatic, NetEnt and Play'n GO titles. UKGC licensed, part of the MGM Resorts group following its 2022 acquisition.

Betfred

Betfred offers 100% up to £50 plus 50 spins. Wagering is 40x on the bonus. The brand is one of the oldest on the UK high street, with a casino product that has modernised significantly since 2020. UKGC licensed, family-owned.

William Hill

William Hill runs 100% up to £100. Wagering is 35x on the bonus. The casino product sits alongside a sportsbook that remains one of the largest in the UK. UKGC licensed, owned by 888 Holdings following the 2022 acquisition.

Bet365

Bet365 offers 100% up to £100 plus spins on the casino side. Wagering is 30x on the bonus, among the lowest in the market. The operator is known for product depth rather than bonus generosity, but the low wagering makes the offer competitive on expected value. UKGC licensed.

Sky Vegas

Sky Vegas runs 100% up to £50 plus 50 spins. Wagering is 35x on the bonus. The site is slots-focused, with a lobby that leans on Pragmatic, NetEnt and Red Tiger titles. UKGC licensed, part of the Sky Betting & Gaming group owned by Flutter.

Paddy Power

Paddy Power offers 100% up to £50 on the casino side. Wagering is 35x on the bonus. The brand is known for its sportsbook, but the casino product has grown steadily. UKGC licensed, part of Flutter Entertainment.

Coral

Coral runs 100% up to £50 plus 50 spins. Wagering is 40x on the bonus. The casino product sits alongside a large retail estate and a sportsbook. UKGC licensed, part of Entain.

Ladbrokes

Ladbrokes offers 100% up to £50 plus 50 spins. Wagering is 40x on the bonus. Similar structure to Coral, same parent group. UKGC licensed.

888 Casino

888 Casino runs 100% up to £100. Wagering is 30x on the bonus, which is competitive. The site has a strong proprietary slots catalogue alongside third-party content from NetEnt and Microgaming. UKGC licensed.

Betfair Casino

Betfair offers 100% up to £100 plus 50 spins. Wagering is 35x on the bonus. The casino product integrates with the Betfair Exchange, which remains unique in the UK market. UKGC licensed, part of Flutter.

Unibet

Unibet runs 100% up to £40 plus a £10 bonus. Wagering is 35x on the bonus. The operator is part of Kindred, alongside 32Red. UKGC licensed.

Virgin Games

Virgin Games offers 100% up to £50 plus 30 spins. Wagering is 40x on the bonus. The brand has a bingo and casino crossover, with a lobby that leans on Pragmatic and NetEnt content. UKGC licensed, part of Gamesys/Bally's.

Grosvenor Casinos

Grosvenor runs 100% up to £50. Wagering is 40x on the bonus. The brand is the online arm of the UK's largest retail casino chain, with a product that reflects that heritage. UKGC licensed, part of Rank Group.

BoyleSports

BoyleSports offers 100% up to £50. Wagering is 35x on the bonus. The operator is Irish-owned with a growing UK presence. UKGC licensed.

Betway

Betway runs 100% up to £50 on the casino side. Wagering is 35x on the bonus. The brand is best known for sports sponsorship but has a solid casino product. UKGC licensed.

PartyCasino

PartyCasino offers 100% up to £50 plus 20 spins. Wagering is 40x on the bonus. The site has a long history in the UK market and a lobby weighted toward slots. UKGC licensed, part of Entain.

Mr Vegas

Mr Vegas runs 100% up to £100 plus 11 spins. Wagering is 35x on the bonus. The site is known for a large games lobby and a strong live dealer section. UKGC licensed, part of Betsson Group.

Pub Casino

Pub Casino offers 100% up to £100 plus 100 spins. Wagering is 40x on the bonus. The brand is aimed at a casual, pub-themed audience, with a slots-heavy lobby. UKGC licensed.

NetBet Casino

NetBet runs 100% up to £200 on first deposit. Wagering is 40x on the bonus. The cap is one of the higher ones in the market. UKGC licensed.

Payment Methods and How They Affect Bonus Eligibility

Not every payment method qualifies for a deposit bonus. UK operators have tightened this since 2020, and the rules vary. The table below shows typical eligibility across mainstream UK brands.

Credit cards have been banned for UK gambling since April 2020. That ban covers all forms of credit, including cards linked to Apple Pay and Google Pay. If your Apple Pay is backed by a credit card, the deposit will be declined. Debit only.

E-wallets like Skrill and Neteller are frequently excluded from bonus eligibility because they are seen as higher-risk for problem gambling and because the transaction trail is harder to verify for anti-money laundering purposes. If a 200% bonus is important to you, deposit by debit card or PayPal.

Which Payment Methods Are Fastest for Withdrawals?

PayPal is the fastest mainstream option, with withdrawals typically processed in 2 to 4 hours at most UK operators. Bank transfer via Open Banking sits at 1 to 2 working days. Debit card withdrawals take 1 to 3 working days, sometimes longer depending on the issuing bank.

Withdrawal speed is separate from bonus terms, but it matters when you are deciding whether a bonus is worth taking. A 200% bonus that takes 3 days to pay out is less attractive than a 100% bonus that pays in 2 hours, assuming both clear at similar wagering. The value of the bonus is not just the headline percentage.

Some operators now offer instant withdrawals on smaller amounts, typically up to £100 or £200, processed within minutes. This is a competitive feature rather than a bonus term, but it changes the overall value calculation.

Are There Fees on Deposits or Withdrawals?

UK-licensed operators cannot charge fees on deposits or withdrawals for standard payment methods. That is a licence condition, not a courtesy. If a UK operator tries to charge you a withdrawal fee, that is a regulatory complaint waiting to happen.

Offshore operators do sometimes charge fees, particularly on e-wallet withdrawals or currency conversion. If you play on a non-UKGC site, check the fee schedule before you deposit. A 2% withdrawal fee on £500 is £10, which can wipe out the value of a small bonus entirely.

Responsible Gambling and Bonus Chasing

Bonus chasing is a recognised pattern of harmful play. It looks like this: you take a 200% bonus, lose your deposit, take another bonus at a different site to recover, lose that too, and keep going. The wagering requirement becomes a justification for continued play rather than a condition to satisfy.

UK operators are required to monitor for this pattern and intervene. Under the Gambling Commission's customer interaction rules, operators must identify at-risk behaviour and take action, which can include removing bonus eligibility, imposing deposit limits, or closing the account. That is not the operator being difficult. It is a licence requirement.

If you find yourself depositing specifically to unlock a bonus rather than to play, that is the signal to stop. Bonuses are marketing. They are not a strategy. No wagering requirement is worth chasing if the chase is the point.

What Support Is Available for UK Players?

The legal age for gambling in the UK is 18. Operators must verify age before allowing play, and any winnings from underage play are void. There is no exception.

GAMSTOP is the national online self-exclusion scheme. Register once at gamstop.co.uk and you are blocked from every UK-licensed operator for a minimum of 6 months, extendable to 5 years. The service is free and cannot be reversed during the exclusion period.

The National Gambling Helpline is available 24 hours a day on 0808 8020 133. Calls are free from UK landlines and mobiles. The service is run by GamCare and offers confidential support, information and referral to local services.

GamCare also runs a live chat and forum service at gamcare.org.uk. For face-to-face support, the NHS National Problem Gambling Clinic operates in London, Leeds and other major cities, with referral through your GP or directly via the clinic.

Deposit limits, loss limits, session reminders and time-outs are available at every UK-licensed operator. They can be set for 24 hours, 7 days, 30 days or longer, and they apply immediately. Once set, they cannot be reversed during the period. Use them before you need them.

Frequently Asked Questions About 200% Deposit Bonuses

What is a 200% deposit bonus?

A 200% deposit bonus matches your deposit at twice its value in bonus funds. Deposit £10 and you receive £20 in bonus credit, giving a total playable balance of £30. The bonus portion almost always carries wagering requirements before it converts to withdrawable cash, typically 30x to 45x on the bonus amount.

Are 200% deposit bonuses still available in the UK?

Yes, but they cluster around bingo brands rather than casino operators. Gala Bingo, Foxy Bingo, Sun Bingo, JackpotJoy and Fabulous Bingo all run 200% structures as of early 2026. Mainstream casino brands have largely settled on 100% up to £50–£100 following regulatory pressure on bonus terms since 2020.

Which UK casino has the best 200% deposit bonus?

On headline percentage, Gala Bingo and JackpotJoy offer the strongest 200% structures, both capped at £50 with 40x wagering. On expected value, MrQ and PlayOJO beat them by offering 200% in free spins value with zero wagering, meaning winnings are immediately withdrawable without a clearing requirement.

How do I clear a 200% deposit bonus?

Check the wagering requirement, the game weighting and the time limit before you deposit. Play slots with RTP above 96% from providers like Pragmatic, NetEnt or Hacksaw. Avoid live dealer and table games, which typically contribute only 10% toward wagering. Clear within the deadline, usually 7 to 30 days depending on the operator.

Can I withdraw a 200% deposit bonus immediately?

No. The bonus portion is locked until you meet the wagering requirement. Any attempt to withdraw before clearing will typically void the bonus and any winnings derived from , and some operators will also restrict your account from future promotional offers. The only way to release bonus funds is to complete the required wagering volume first. Once cleared, the remaining balance converts to cash and can be withdrawn through your chosen payment method.

Do 200% deposit bonuses expire?

Yes. Most UK operators set a window of 7 to 30 days from the moment of deposit, not from your first spin. Gala Bingo and Foxy Bingo typically allow 7 days, Casumo and JackpotJoy allow 30, and LeoVegas sits at 21. Free spins attached to the offer often expire faster, usually within 24 to 72 hours.

What happens if I lose the bonus before clearing it?

If your balance hits zero before you complete the wagering requirement, the bonus is gone. There is no reinstatement and no partial credit. This is the most common outcome on high-volatility slots, where a 200% bonus can vanish in under 50 spins. Lower-volatility titles give you a better chance of surviving the clearing period.

Can I claim a 200% bonus at more than one UK casino?

Yes, provided you are a new customer at each operator. Welcome bonuses are one per person, per household and per payment method. Using a different email at the same brand will not work, and attempting to claim twice can result in account closure and forfeiture of any balance. Different brands under the same parent group, such as Gala and Foxy under Entain, are usually treated as separate for welcome offers.

Are 200% bonuses worth taking?

Only when the wagering is 40x or lower on the bonus alone, the game weighting is 100%, and you plan to play slots with RTP above 96%. On those terms the bonus has a small positive or near-neutral expected value. On 65x wagering applied to bonus plus deposit, the expected value is clearly negative and the offer is marketing dressed as generosity.

What is the difference between a 200% bonus and 200 free spins?

A 200% bonus credits cash-equivalent bonus funds that carry wagering requirements before withdrawal. Free spins credit winnings from a fixed number of spins, often with a separate and sometimes lower wagering requirement. MrQ and PlayOJO both run spin-based offers with zero wagering, which frequently deliver better real value than a 200% cash bonus with 40x terms.

Do I need to use a promo code for a 200% deposit bonus?

Most UK operators no longer require a promo code for welcome offers. The bonus is applied automatically on first deposit, provided you meet the minimum, usually £10. A minority of brands still ask for a code at the cashier stage, and missing it can mean forfeiting the bonus entirely. Check the terms before you deposit, not after.

Can I use a VPN to claim a 200% bonus from outside the UK?

No. UK-licensed operators verify location at deposit and at play, and a VPN will trigger a verification check that usually ends in account suspension. Circumventing geo-restrictions also breaches the operator's terms and voids any winnings. If you are outside the UK and want to play on a UKGC site, you generally cannot.

What is the minimum deposit for a 200% bonus?

£10 is the standard minimum across almost every UK operator running a 200% structure. A few brands set it at £5, and a handful require £20 for the full bonus. Depositing below the minimum usually means no bonus is credited, though your deposit remains in your balance as cash.

How long does it take to clear a 200% bonus?

At £1 per spin on a 96% RTP slot with 40x wagering on a £20 bonus, you need 800 spins to clear £800 in stakes. At 3 spins per minute that is roughly 4 hours 30 minutes of continuous play. Higher stakes shorten the time but increase variance. Most players take several sessions across the bonus window rather than clearing in one sitting.

Final Thoughts on 200% Deposit Bonuses in the UK

The 200% deposit bonus has become a niche product in the UK, concentrated in bingo and a small number of slots-first brands. That is not an accident. Regulatory pressure since 2020 has pushed operators toward smaller, cleaner offers that are easier to advertise compliantly and easier to defend if the Commission comes asking questions.

If you want a literal 200% match, Gala Bingo, Foxy Bingo, Sun Bingo, JackpotJoy and Fabulous Bingo are the realistic options, all with £10 minimum deposits and 40x to 45x wagering on the bonus. If you want the best expected value, MrQ and PlayOJO beat them with spin-based offers that carry zero wagering, meaning any winnings are yours to withdraw without a clearing requirement.

Run the numbers before you deposit. A £10 deposit for a £20 bonus at 40x on the bonus alone means £800 in qualifying stakes. On a 96% RTP slot, that is roughly £32 in expected loss against a £20 bonus. The maths is tight but survivable. On 65x wagering applied to bonus plus deposit, the same bonus becomes a clear loss. Read the terms, check the game weighting, set a deposit limit, and treat the bonus as a marketing offer rather than a strategy. That is the whole game.