In this case, I think you could work around that, as they could implement a high capital gains tax rate for cryptocurrency sales. Then it would only impact people who mine.
Obviously it seems they are going in the exact opposite direction on this, though...
Mining is reportable as ordinary income in the US.
Cryptocurrency earners have to report ordinary income taxes as well as capital gain/loss taxes.
Its not that hard, less than ideal, its also easy to immediately convert to USDC or fiat automatically, or find other deductions to reduce or eliminate the tax burden.
Obviously it seems they are going in the exact opposite direction on this, though...