Not all "blockchain" is the same (case in point, there are firms that do Anti-Money Laundering/Fraud and Counter Terrorism Funding activities which use lots of big data/ML stuff).
Disclosure: I work for one of those firms (CipherTrace) so I may have some bias, but really, this is the portion of the Fintech/Crypto spectrum I find acceptable.
Always assume for anything that affects the economy at a macro level to eventually end up coming under the scrutiny of regulatory action (no matter how much ink is given otherwise) and that AML/CTF will be applied.
Disclosure: I work for one of those firms (CipherTrace) so I may have some bias, but really, this is the portion of the Fintech/Crypto spectrum I find acceptable.