Probably Long Overdue
With China also clamping down, it's looking like the days of crypto currencies are numbered. As a replacement for state-controlled currencies they're a miserable failure. In fact the interest in them has exploded only because people see them as a way of potentially making more dollars / pounds / yuan / shillings, which kinda reinforces the perceived value of a state-backed currency. And they only became a vehicle for that because exchanges got set up making the conversion possible in the first place; we've never really been able to conduct trade using crypto currency.
Framed that way, crypto-currency speculation is entirely parasitic; you make a profit on a cryptocurrency because someone else has made a loss, not because you or (more importantly) anyone else has done any actual beneficial work. Other than to pay an electricity bill, or stolen someone else's, neither of which is beneficial; it's a waste of energy.
p.s. never bought or mined any myself.