The question "Is a casino bonus worth it?" usually comes up after a bonus has vanished, taking its winnings with it. That alone is no sign of a rigged game; the usual cause sits in the terms: an expired deadline, an early withdrawal, a winnings cap or an irregular play clause, and the transaction history and support record are worth checking. Each of these can be seen in advance, and a short read of the terms shows which of them apply to any particular offer.
Bonus terms include clauses on irregular play, and they are written broadly. Typical examples are betting on both sides of an even money bet, switching to low risk play to clear wagering, raising stakes sharply after a bonus is converted, or signing up for more than one account per person or household. A casino that finds such a pattern, often during the verification before a first payout, can void the bonus and its winnings. Reading the clause shows which patterns a casino names, and which ones it leaves to judgement.
Casinos can change the terms of their bonuses and cashback offers, and most promise that a bonus already claimed stays under the version accepted at the time. The promise matters only if the version can be shown, so saving the terms on the day an offer is taken is worth the minute it costs. The same goes for anything support agrees in chat: a saved copy of the conversation settles more disputes than a memory of it.
Common doubts
Can a withdrawal request cancel an active bonus?
Often yes. Asking to withdraw while a bonus is active can remove the bonus and its winnings, and some casinos apply this to the deposited cash too.
What is a winnings cap on bonus play?
A limit on how much can be withdrawn from bonus winnings, often a multiple of the bonus or a fixed amount; anything above it is taken back at conversion.
Can a player cancel a bonus on purpose?
Usually from the account page. Doing so frees the cash balance but removes the bonus and whatever was won with it.
Are several accounts per household allowed for bonuses?
Usually not. Opening more than one account per person or household is a common abuse clause, and it can void the bonus and its winnings.
Why save the terms when claiming a bonus?
A saved copy proves which version of the terms applied on the day the offer was taken, which matters if the casino later changes them.