How? Beyond creating a few lottery winners, it has no utility for the average person.
In the real world, "utility" doesn't exist unless it benefits a select few.
State governments have had a monopoly on lotteries for my entire lifetime, so if we've granted that crypto is nothing beyond a lottery ticket, then there is no issue with society regulating it to whatever degree we can agree on.
For the utility of decentralized currencies, it's best you get information from more than an Internet comment. Which sources have you used already?
Investments have utility, speculation does not.
Time was Bitcoin proponents would talk about the future of money (investment).
Now everyone just wants to get rich at the expense if the poor fool who comes later (speculation). We're now at the mania stage of this bubble, where crazy things happen and ordinary people invest because of the distorted prices.