It is known that a large number of gamblers, after losing, accuse the casino of cheating. But he didn't lose that money, he is angry about the waiting time for the return of the deposit. He's just frustrated that his money is frozen, and he can't do anything about it.
Well, if I am not wrong he deposited the funds to wrong chain so he has no reason to accuse anyone since the mistake is done by himself only. The money isn't frozen anywhere it was confirmed and deposited to the address but since he doesn't hold the private key he can't access them the only maximum thing he can do is to request the casino to refund the money if possible but shouting at them will reduce the chances of getting them back.