>That's a societal problem, it can only be solved by society, not by cryptocurrency peddlers and tech-bros. And in any case: at some point that "wealth" has to enter the real world, and it's there that governments can step in and seize said wealth.

People escaping oppressive regimes don't have time for their society to solve it, they need to leave to a different, less messed-up society. And this is one of the few ways that they can bring a decent fraction of their assets with them in a form that's not very easily stolen from them.