Unless someone with vast capital assets is willing to accept units of fantasy money in trade for those assets, it has no real value besides hucksters finding Greater Fools.
Worse than cryptocurrency being fantasy money, it literally wastes an Argentina worth of power (and growing) every year. I doubt the entire global financial industry, including all mainframes, office buildings, corporate jets, and commuting workers uses even one Argentina with of power in a year. And the global financial industry is doing billions upon billions of transactions for trillions upon trillions of dollars.