but there is still a lot of dissent crypto is a ponzi scheme or for fraudsters

There are a lot of other great use-cases you're missing: Money laundering, circumventing sanctions (North Korean missile program is not gonna fund itself), buying drugs online, ransomware, assassination markets, illegal political donations, hard to trace bribery, and I'm sure a ton more.

But it's not fair to paint with too broad a brush.

It's just the 99% that give the 1% a bad name.