Its had been always part of the terms on where, if you do make out a deposit on a gambling site then they would surely ask out some roll-over before you can make a withdrawal. Why? this had been part of that anti-money laundering act yet we know that these gambling platforms can be used as a medium for those dirty coins to be mixed up and then withdrawn after that.This is why its just normal to have this kind of set-up and this had been known already by most gamblers.