It does have a utility though, buying drugs, moving money past capital controls, and creating fake revenue/losses for laundering money and tax evasion.
The dollar is the favourite currency for that stuff. Cryptocurrencies are meant to take power away from banks and give it to the people. Sure, the vast majority of the people use them for spsculation, but that doesn’t make the technology useless. It’s just that people are mostly interested in making as much money as they can. That’s a society problem, not cryptocurrency’s.