As we know that most gambling sites will require you to gamble and wager your whole balance once, before you can cash out or withdraw from the gambling site and they take this measure so people do not do money laundering whereby deposit and withdraw without gambling.
Now the point here is that on the gambling site, there are many easy winning bets with odds like 1.01x etc. If the money lauder is sensible he can easily be wagering the whole amount by placing a few bets where the odds are very low and the winning chances are 99%.
So does this mean that there is a loophole here and the money launderers can easily by pass this wagering requirement?
I wouldn't say it's a loophole though, for gambling sites, this could just be a way to know that gamblers are really putting their money to play that's it. They might not think of it as coming to some criminal activities or it is tainted.
If you satisfy the gambling sites, then you are free to do whatever you want. But as far as I know, you really need to wager that big money and lost it to them before you can withdraw. Which means you need to deposit more.