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
(or should be able to) and it will have to be done for tax reasons - but you will have to do
what amounts to KYC procedures to do it. I meant that your attempts at 'privacy' are screwed once you do that.