I would add some other topics also:
- influence on the state currency
- using of the bitcoin for criminal purposes in the country
Criminals had their way of performing transactions way before cryptos came into existence. Moreover, to cash out a huge amount, one would need to get verified by the cashing out portal (bank or something) and so they don't like these. Anyways the crypto community itself have so many bad internals scamming people each day.
You are talking about big guns here, the ones like Columbian drug lords, Italian mafia, Japanese gangsters, Russian oligarchs. These are not interested in crypto as it is too small for them and the scale of illegal businesses or activities they are involved in. Crypto is for small-fish criminals and more tech-savvy ones like hackers, blackmailers, Internet scammers (which you referred to), and their likes. But these are still criminals by any measure and would be prosecuted as such in any country
Unlike the big guns I mentioned (which are still not interested in crypto)