It seems rather unprecedented that there are currently US citizens who are billionaires because of their crypto holdings, without the government having any insight into precisely who these people are. It seems like eventually the government is going to push for more onerous reporting laws to return to the usual equilibrium, where the government has at least some basic idea regarding who owns what (which I think they…
Consider the fact that illegal enterprises like drug dealers will pay a premium to launder the money (probably >=10%) and then pay taxes on the remainder. If you have the gains legally (crypto), it makes little sense to not just pay the normal taxes.
Also, if you made a significant amount of money on any crypto, you probably held it for more then a year at which point to capital gains tax is probably at most only 15% (Anyway the taxes are basically nothing compared to the benefits of having 100% clean money that can be reinvested and make 10-15% in the stock market.