Many online casinos offer new player bonuses that pay the first installment, and often later. These bonuses are a form of marketing that may incur costs (perhaps justified to attract a new player who can return and deposit many more times), because the casino essentially allocates money for the player's betting obligation. A certain minimum amount until they are allowed to cancel. . As all casino games have a home advantage, the betting requirements ensure that the player will not be able to simply leave the casino money immediately after the bonus is given. These betting requirements are usually high enough for a player to have negative expectations as if they were deposited and did not ask for a bonus.
The casino may decide to restrict certain games from betting, or to restrict players from playing low games or to limit a free game (betting, such as red and black roulette, betting), thus completing the betting requirement Guaranteed earnings after taking into account the prize.