Turns out that governments do not like anonymous cryptocurrency at all.
The reason why surveillance-state-centered interests cannot ban cash is that the public wouldn't stand for it. It's too ingrained in the culture and economy. The same needs to happen with private cryptocurrencies. We need MetaMask to adopt a confidential transaction standard the same way the major websites adopted HTTPS over a decade ago. We still have time as the financial mass-surveillance laws in place were designed for trusted third party financial intermediaries, and not peer-to-peer finance.
If such a crypto would exist, with enough stability, trust and ease to make transactions, the state would be so unhappy that day that it would make it illegal faster than light. Removing monopolies from the state are huge challenges.
People who have bought through sites like these have often found amazon refuses to honour warranties etc on the purchased goods, and when they've dug a little deeper it's been because the real cardholder or account holder has flagged the transaction as fraudulent.
In all seriousness, I think some form of cryptocurrency could serve this purpose and move us away from relying on banks that act on behalf of the state. Obviously there's a whole lot of baggage with the current cryptocurrencies out there today, but there's no reason we have to resort to carrying around pieces of paper or voting for the right people to ensure our assets and livelihood are outside of the reach of the state (at least without going through the proper legal channels).