If ponzi is wrong no matter what then casino is also wrong.
What casino did until you said they are wrong? Casino is a place where you gamble your money, have provably fairness system too, so which part of casino is wrong from you?
If casino is wrong, there will be no any casino/gambling site until now. All casinos will shutdown.
No matter how long your explanation about your ponzi, it's very far from casino (it's even doesn't have any relation between them)