>I'm also very concerned about privacy, I'm that sort of HN person - never had a Facebook account, run self-hosted email for 20 years, use Signal for messaging as much as I can, etc. But I don't think cash is a good solution to privacy. I'd rather see laws and (better) cryptocurrencies as the privacy toolkit.

We wont see those. Instead we'll see more enchroachment of privacy - because cash was actually the solution: existing for millenia, trusted, no transaction fees, no monitoring of purchases, non remotely invalidated, not requiring fancy technology to use, works from buying a car to getting some help as a beggar on the streets.

>That at least is illegal here.

Would that ever stopped companies pulling that shit?