Why did you use?

If you want to avoid a restricted country casino with "VPN" then you are not allowed to do that, because you are from a restricted country. If you still insist to play by using VPN to avoid the block, then in case the casino what country you are from they can block your account and forfeit the winning.

I check on the T&C, no mention any VPN and some list of blocked country. So, better to wait answer from the @OP.