The most defensible / widespread use-case of getting money out of an oppressive regime strikes hollow to me as a lefty. Most people in an oppressive regime don't have the problem of moving large amounts of money around. And it only helps you with "temporarily store it somewhere with a wildly deviating value", how does that help when you need to get it BACK into your hands and actually spend it?

The real exploitation for 99% of the population isn't someone currency-manipulating your fortunes, it's being a de facto wage slave because we live in a system that decides at birth that you're a slave and 1% of people aren't. Crypto doesn't help you with that, ironically it makes it worse because it helps the kleptocracy move their money. That's who has a use for anonymous money, and they're normally robbing the locals. See: the Panama Papers, Russia