I think it's quite likely they break the law in many jurisdictions. And if not, I think it's very likely that mint operation will be outlawed in the near future. It's not like financial legislation tend towards permissiveness.

Cashu might be wise to adopt the assumption, right or wrong, that mint operation will be cracked down on. If it chooses to exist at the mercy of lawmakers, it is doomed. That's why I think the future of Cashu, should it survive, is pseudonymous mints, possibly running as Tor onion services. This path will be riddled with rug pulls, but over time, trustworthy mints will emerge, not merely by the Lindy effect, but also through relentless user vigilance and by the application of proof-of-liabilities schemes.