You are completely mislead if you knew that ToS is only applicable to new user. It’s applicable too on existing players if they manage to register before the list of country in the ToS is not updated. You are breaking Stake rules If you are residing on one of those country prohibited by the casino and your account might be subjected for closure once Stake figures it out worts if you win huge amount because they do background check on account that win jackpot prize.
It’s better to not play in the casino that prohibiting your country because it’s the country policy itself and Stake is breaking your country law if they allow you to play.
The list of prohibited countries is updated regularly that's why asking to support is a good idea
Sometimes we wonder why stakes provide mirror links well most users use it to break through restrictions
Or if they are still in doubt it's better to look for another casino, why take the risk