When he starts making big money, the block will be done stating violation of terms and conditions. This is unfair, and this means the gambling platform is scamming the gambler and not the gambler scamming the gambling platform.
It might be unfair but not illegal. Why? Because casinos know what they're doing. They don’t block an account without a solid legal reason. So, just accept the reality and take the "moral" aspect out when dealing with this kind of business. We have to be clever like them to play the game right. You know you're accessing a casino illegally, so what do you expect them to do? Of course, you should expect them to flag your account in the future, unless you're playing dumb.