I think Casino blocking players accounts who are exploiting the casino is a just move. These players are breaking rules to take advantage of the casino which is considered as breach of contract. I don't find it unfair because the casino blocked these cheaters during their withdrawal after these cheaters won some huge amount. I support this kind of action, blocking or banning the account of players that are breaking the casino rules for their advantage.
Aside from that, ignorance is not an excuse for the player to conduct such cheating, or to break the Casino terms. It is the players responsibility to read everything about the casino's terms and condition, once players are found guilty of breaking the casino's term, or exploiting and cheating in order to take advantage of the Casino platform, it is reasonable to block these players especially when they are trying to withdraw the winning from these illegal actions.