Given the transparent nature of the blockchain, it's actually very hard to hide illegal activity on it. Much of the reason for my bullishness on crypto is that it makes graft harder. I wonder how much of the sentiment against crypto stems from beneficiaries of opaque institutions.
But legitimacy and legality diverge.
Not sure if it’s marketing BS or similar, but I’ve read that some people used it to circumvent defunct government or hyper inflation.
If that’s true, then I side with those that want to live a decent life despite corruption and (international) politics exploiting and oppressing them.
Again, I don’t know how reliable that info is, and I doubt that there isn’t a better solution.