Often there is such a condition: you need to achieve a certain turnover, that is, for example, make at least 100 bets for a certain amount. Only after that the player, if there is something left of the bonus, will be able to take the money from the casino for himself. Here is a specific example: the player received $100; to withdraw them (you can withdraw your own funds without restrictions), you need to make 100 bets of 10 each. All those funds that remain on the balance and will be bonus, but played, can be withdrawn.