The problem people in your predicament will face is that one way or another if they self-exclude then manage to get access to gamble again, they can blame the casino when they are losing (but the same player will probably have every intention of staying quiet if they are winning).

In my opinion, if someone has asked a casino to exclude them they should not be allowed to play on any of their accounts for whatever the stipulated period was. If for one reason or another those players are allowed to have access to their accounts again before the end of the stipulated period then the casino has to accept responsibility for failing the player. Having said that, does that means the casino should return all of the deposits if the player loses? If it does, it must also means if the casino becomes aware of their failure after the player has won, they can block the player from withdrawing all winnings and instead return the deposits.