A search for "wagering requirements not met" usually comes 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 few minutes with the terms show which of them apply to a given offer.
Every bonus has a deadline, and usually two: one for claiming it and one for completing its wagering requirement. When the second passes, the bonus and any winnings still tied to it are removed, however close the player was to meeting the requirement. Whether the bonus works as free spins or as a deposit match, deadlines range from a day for spin winnings to several weeks for a large match. The clock often starts at the deposit, which means a slow first session already uses part of the available time.
Requesting a withdrawal while a bonus is active often cancels the bonus and everything won with it, and some casinos apply the rule even to cash deposited alongside it. A player can usually cancel a bonus on purpose from the account page, which frees the cash balance at the cost of the bonus. Knowing where that option sits, and what it does to winnings, turns an accidental forfeit into a choice made with open eyes.
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.
Answers in brief
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.
Can a casino change bonus terms after sign up?
Casinos can revise their terms, though most promise that a bonus already claimed stays under the version the player accepted at that time.
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.
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.
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.