Why should someone use a casino as a wallet for storing his money? That is something that someone who does not understand how gambling works should do because those who understand knows that keeping large money in a casino balance exposes the money to the risk of being used to gamble which may result in total loss. This is possible beside the risk of the casinos being hacked or something else causing the money to be lost in the casino. The right alway is to only leave money for gambling in the casino and withdraw any other thing immediately.
If the money is not going to be used for gambling, then why leave it there?
People continue to take these kinds of risk and go out there to blame the casino when it gets out of hand.
We already know about the first wagering rules that almost all casino have, you putting your money on a casino account you have to wager at least 1x to unlock them before withdrawals. This already puts the money in danger because you will have to gamble it.
Casinos, exchange are not meant to store your coin, they are meant to provide you services and when its complete you don't have to leave any money there.