This is a good point, but, and there is always a but....
Volatility is a simple calculation and can not be banned or manipulated (I assume). So is the weather futures. Not true with cryptos. What happens if the US government outlaws bitcoin as currency?(but not as investment, as Chine did) What if they completely outlaw it so you can't even own it in the US? Will the futures cease to exist? Until the US government takes an official stand on cryptos in general, the introduction of futures is premature. But they want to collect commissions.
TL; DR: not all non-physical futures are equal...