I have made some findings about this before if I remember correctly. There are people that have sued gambling sites before but the result has always been the gambling site winning the lawsuit. So just know that if anyone sue any reputed gambling site, the gambling site may win the case.
I agree with you on that matter, but you know what's worse than a lawsuit for these casinos? When their reputation gets destroyed in the community. If players start calling them out as scammers and the community backs it up, that's permanent damage and everyone will avoid that casino.
In a lawsuit, even if the gambler wins, it's usually just quiet settlement money. The player takes the payment and moves on, and the casino keeps operating like nothing happened. But when the whole community turns against them? That hits much harder where it really hurts their business.