This is called the long con or the big con, while many scammers try to get whatever they can as soon as they can, there are other scammers which concentrate on extracting as much money from their victims as possible, so it would not be rare for a scammer to set a casino and make it seem legitimate by offering a great service and eventually gaining a good reputation, until eventually and without anyone expecting it the casino turns into a scam and all the funds of their customers are lost.
I can understand that for some altcoins for example, but a casino can legitimately earn a lot of money, forever basically.
There would be no point to stop being a casino, because that's just guaranteed money really.
Unless the casino is doing something out of the ordinary, like extra bonuses or something different, then I don't see the point of them stopping.