Any casino must be have wagering requirement and maximum amount that able to withdraw because if they don't have any wagering requirement the gambler can easily abuse it and if the gambler is really lucky, they can try to make as much as they can that will lead the casino going bankrupt.
You've given great input guys.
Lately, there have been many cases of gamblers abusing the bonuses given by casinos, but casinos have responded to this case by freezing the accounts of gamblers who try to take advantage of bonuses on purpose.
Bonuses that have requirements can be misused, especially if the casino only gives bonuses for free, then it could be the casino that will experience big losses.
If you don't provide conditions for bonuses, the aim is to be more able to attract gamblers, at least the requirements are made easier so that casinos are not at a disadvantage due to abuse of bonuses and gamblers can still be attracted because the requirements for bonuses are relatively easy to fulfill.