And then you mix in DeFi. Or into and out of L2/HTLCs. Or via atomic swaps, which went live but are buggy, and won’t show the monero interaction. Or cross-chain. And on and on. Let’s ban it all?
I don't think you can ban people doing crypto entirely, but you can make the financial exchange points where cash goes in and out ever more difficult.
It’s in the process of being grey listed. Similar to running an all-cash lifestyle, it’s possible. But you’ll have your money frozen and seized and stolen from time to time. And you will hit intentional roadblocks any time you attempt a major financial move.