A computer is much like a car or a gun, their ownership blurs the line of public, private, and personal property. I think we can all agree there is something fundamentally wrong with an individual buying a whole bunch of GPUs to mine crypto. How much computing power is too much for an individual person to be allowed to possess?
Modern crypto mining is pretty thoroughly industrialized. The need for a cheap energy source and lots of high-end hardware filters out one-off miners. That's why you see businesses setting up around abandoned hydroelectric dams and out in West Texas near natural gas mines.
I don't think a regulation on private ownership of GPUs would do anything substantive, in the same way that a ban on owning large numbers of cars or guns would meaningfully impact the prime offenders - rental companies or police agencies.