make a first deposit and withdraw all their balances without making a bet. Of course this will be detrimental to the site, but because the user must make bet, the bonus will be received after the user reaches the betting limit as a requirement.
All bonus did not work like that's
Almost every casino who doing some bonus deposit and other things will always put a requirement minimum wagering before they cant really withdrawal all his money. If they want withdrawal the money then must complete wagering or deposit without taking deposit promotion.