Even if HN had a monolithic opinion on the uselessness of cryptocurrencies, your example illustrates a case where they are indeed not necessary, with the alternative satisfying even the “extremely paranoid”.
Cash has slower transaction speed (snail mail vs <30 min). Requires additional supplies to use (pen, stamp, envelope). It’s illegal in the USA to send cash in the mail. No way to get delivery confirmation without risking deanonymizing yourself.
https://www.snopes.com/fact-check/sending-cash-u-s-mail-ille...
[0] https://finance.yahoo.com/news/bill-ackman-says-visa-tomorro...
Not just "acting outside their authority". Law enforcement can ask for a lot of things where the answer can be no. There are lots of cases where caving is optional, and it's better when companies don't cave.
Responding to court orders is different from generically responding to law enforcement.
Also civil disobedience is a legitimate response to being forced to log browsing activity.
> or foreign to their resident jurisdiction
Which they are.
"No" is a fine and acceptable answer to many cooperation requests by law enforcement.