You know what, this narrative is funny, because 99.999% of the time in which "crypto" is used to evade taxes, it's the kind of taxes that would need to be paid because of capital gains on the crypto assets because their value increased. But most of the time, they are unrealized gains, which means that tax evasion didn't actually happen. But anyway, let's now think of the cases where the person sold the crypto back to fiat: how easy is to evade taxes at that moment? Not very, because most exchanges report trades to authorities.
And anyway, the fact that their crypto balance increased is due ultimately to politicians doing QE! So they tax us in a hidden-way via money-printing, and after the scarce assets increase in value because of this, they want to tax us again.