-cut-
I know, its my mistake. I should not have used a VPN to bypass the rules. (I now live in a restricted region)
-cut-
Does the gambling site prohibits using VPN?
The answer to this is when a casino or gambling sites prohibits the use of vpn from specific jurisdiction and you went ahead using vpn to bypassing those region by using vpn that is prohibited on their site, this shows that you wouldn't have access to the account since your account violates their ToS and it's better not to use that account anymore or you must go to that country which you used their documents to pass the verifications.
OP wrote 3 sentences, and one of them explained how he bypassed the rules. And by rules OP is obviously referring to ToS, as there are no other magical "rules". From that alone you could deduct that ToS prohibits VPN.
With a little effort you could also have confirmed that from the ToS. You didn't even answer to the question OP made. You basically repeated it with ChatGPT style.
Everything depends on the terms of the casino,
Really!
I disagree with due respect. This statement in itself is not correct. There are regulations in place that oversee casino practices. Casinos are not GOD if they write 'our decision is final' in small prints somewhere in the terms and conditions.
I agree. In some cases there are laws protecting users that contradict with casino's policy, but like in many casinos, rules like VPN are basically work as a disclaimer, because casino's want to comply with regulations, and leaving loopholes for users is a legal nightmare. If it was up to casinos, these kind of rules would only apply to bonuses and arbitrage betting (i.e. cheating). They wouldn't care about aml if they weren't forced to, as dirty money is income as well.