You could say "bad apples" and fair enough, but even with that as a given, I haven't seen any utility out of cryptocurrency as a whole. I'm sure you can find to a nifty little tech demo for something, but I haven't seen any large adoption for cryptocurrency outside of a "greater fool" investment scheme or buying drugs.
Stablecoins are kind of a cute idea, but as I learned from the unregistered security scam from Gemini, they're basically just a farce.