Cryptocurrency allows people who are otherwise limited by draconian payment platform limitations, puritanical moralists who own credit card companies and such to buy and sell things online without being stopped. It's obviously not a good system but it provides a high effort release valve, a fallback mechanism that hopefully will undermine some of these draconian measures. Lots of people have been helped by the existence of cryptocurrency because of this, especially since lately a lot of bad actors control payment platforms and often just shut down businesses on whims.

Whether more have been helped or hurt is debatable but it certainly has a tangible, if niche, use case with real value. It certainly has no value as a store of value, though.