^ There's nothing wrong with it, I guess if you trust the gambling site platform that you use and you believed what they have a provably fair algorithm system they used. After winning a huge amount if you doubted them you can transfer your fund into another gambling site or transfer into your main wallet. This is a case to case basis and it will depend on the gambling site I use. I know it is hard to defeat the house edge but if you will win, your luck will be there and playing after winning will depend on you. Nevertheless, always use a reputable gambling site before you made a deposit.