No no you got this the wrong way. They're not forcing you to use your money. You're making it look like they're forcing you to use your money since they won't block the account. See the thing is blocking accounts are only a thing for people who can't seem to stop spending and this means that THEY themselves spend the money, the casino does in no way force you to spend it. It's common sense really. Let's not be entitled shall we? In the first place signing up to a casino only to ask them to block you because you don't want to spend money just seems dumb.

And I also don't really see an issue here, you were able to withdraw your funds so I think tjat's that. Them blocking or not blocking your account? Doesn't look like it matters, just forget about the casino, end of the story.