If you are staying within the crypto-space and not going through centralised Legal entities to convert to and from FIAT (TENDER FOR LAW), then they have absolutely ZERO jurisdiction to impose any taxation on your private crypto holdings or earnings.

There is no need to hand over jurisdiction when not needed and it is quite clear to anyone with a working brain that the Babylonian Legal system including governments/banks and other bankers masquerading as public corporations are completely corrupt and commit crimes against humanity including poverty and war crimes on a daily basis. Why on earth anyone would want to voluntarily hand over their assets when there is no need to is beyond me. I'm against funding criminal non-transparent organisations myself.