The question was for fiat transactions, as I was wondering about the relevance of such regulations. But as you correctly point out, the fact that I'm questioning the relevance is probably a good indication that financial surveillance has already been achieved in many countries. E.g. in Korea, where efficient capital control laws explain the infamous Kimchi premium. A follow-up question would be to specify the country of each respondent, but I'm not in the KYC business, so I'll refrain from asking it~~ I also try to use cash as much as possible for small transactions. Paradoxically, in Korea, cash is still king for small businesses. And the government is allowing it, as it would be political suicide to rein it in, as many small businesses survive only because of being allowed to operate in this grey zone of tax avoidance.

Where did you see that? I have a pile of coins from different countries I visited that I'd love to transform into sats~~