I use it to receive donations and pay my vps. Government regulations on foreign currency is too heavy and converting ARS to USD costs me quite a lot of money.

I don’t think it’s very usable for day to day payments, but if you need to bypass stupid government restrictions, nothing beats it imho.

Doubling my savings these last 3 months was a nice bonus though.

Well you can’t lend or borrow BTC because of the wild volatility so there’s no real banking possible, but I can see usefulness as a cross-border payments system or a store of wealth if you’re in a place with broken currency and/or financial institutions. So maybe if I were in Venezuela I’d love BTC?

The UK now has UWOs - so for the largest cases (they probably don’t care so much about smaller transactions) they could probably find out through serving a UWO:

An unexplained wealth order (UWO) is a type of court order issued by a British court to compel the target to reveal the sources of their unexplained wealth.[1] UWOs were introduced by sections 1–2 of the Criminal Finances Act 2017 and are governed by sections 362A–362T of Part 8 of the Proceeds of Crime Act 2002. Persons who fail to account are liable to have assets seized after an enforcement authority, such as the National Crime Agency (NCA), makes a successful appeal to the High Court.

From: Unexplained wealth order - Wikipedia