Nothing at all.
Honestly, when your tax office ask you from where did that money come from, explain to them why it came from gambling site, especially if you country banned online gambling.
So you mean to say gambling websites are enforcing KYC's so that I have a valid answer to my tax officer when questioned about my money ? That's interesting.
No, I said there is nothing wrong in using proxy.

If gambling is banned in my country and yet I'm finding ways to gamble,I think I'll have my own back-ups to liquidate money as well.
That is called money laundering and breaking the law.