As soon as you (try to) exchange your crypto into fiat you will be screwed because your assets have no proof of origin.
Who says you can't figure out a way to prove how the assets have been earned? No sane country will say no to recognizing income it can tax.
I did not say you could not prove where the assets came from. Of course you can and it will have to be done for tax reasons - but you will have to do KYC procedures to do it. I meant that your attempts at 'privacy' are screwed once you do that.