If we win on gambling sites and keeping them as bitcoin will make us no worry to pay taxes since it is not traceable but when we are trading them or converting them through exchanges you will get recorded by exchange's contract address so you will get caught if you are cheating to pay the taxes to governments.
Still, there is not any difference in taxation. You are getting taxed when you exchange your crypto to FIAT. In my country, I think that if for example deposit 100$ and you are to withdraw 200$, this 100$ difference is taxed as investment earnings. You don't have to prove that you gambled this money and you got more. You are been taxed for the amount and not for the usage of it if you see my point.
Yes thats it,we need to pay the taxes as investment based earnings when we convert them but if we keep those $100 profits as crypto then we no need to pay any taxes right.