Have you ever profited by gambling or betting in that casino? Because, in my opinion, it sounds almost gullible to claim they have had been nice to you until this day.
Of course it would make sense for them to be "nice" to gamblers who continue to have bad luck, so they can continue to profit off their misery and loss chasing. But there is something all people who have problems with this casino have in common: they are all winners, they managed to make money out their luck and when the time to withdraw their earnings came, they got blocked and thrown on the dust tin.
You just happened to be profitable for them, they knew this, so they did not wanted to scam anything out of you (you were already providing them with legal profits).

It would imply this scam casino keeps a register of the profit/loss rate of their gamblers/victims and deny self-exclusion for those who they consider to be profitable enough. That goes beyond having a business strategy, it is right down evil and inhumane. 💔