Case in point, marijuana and sex work/pornography, even where legal, are very often not permitted in the financial system and often have to deal directly with physical cash, and of course were some of the early adopters of cryptocurrency.

You don't have to find either of these use cases acceptable to understand the risk at play when the financial system can be used as a mechanism of control used to try to snuff out things the establishment upper class doesn't like without going through proper legal channels and kept in check by our elected representatives.