Sometimes, we tend to break the TOS just to enjoy gambling despite the restrictions but as we take the risk, we should also keep in mind that our funds aren't in a safe place. 1500 is still a huge amount but to be honest, it would be hard for you to recover it. VPNs aren't that safe these days.
Maybe it's just a penny he was playing around with, you never can tell. He knew the risk of gambling in a non-jurisdiction area but he still went ahead, that's even gambling for taking such a risk.
VPNs are safe, depending on what type you are using, some VPNs are not strong enough to cover your tracks on some websites.
Did they ask for the KYC when you were depositing funds ? No right most of the times this happens and problem is that you used a VPN ofcourse which will end up against their rules and regulations causing your winnings and everything to go, they won't be allowing you to withdraw anymore as well since this would be against their policies. What you can do is ask some friend of yours from other country where the crypto is legal to do that and this can actually work only if they don't suspect it but then again be would be making the bets on your behalf much like a third party which is again scary to trust regarding so much money.
You forgot the part where OP says he has chosen Hongkong as his location and that's another area where crypto betting is not allowed. He has done a big mistake that he just had to let's go as a loss and win for the casino.
so are we going to hear from the OP what is his final decision on this situation of his? but whatever the outcome will be, i guess he should be prepared to accept the verdict from the site. curious how things will turn out on this case. another reminder that we should check and review the ToS of the site, even if we say they allow us to play.