It should be Proof or Waste, or Proof of Heat/Entropy. The work being done is difficult, yet trivial and only valuable because it yields coins. Miners convert free energy into heat, for funny money, and it doesn’t scale well. Sure, maybe PoS could work (I doubt it) and maybe renewables could be the future of mining. Unfortunately we’re stuck with a majority of miners burning coal in China to show off the required volume of entropy to cash in.

When this fad dies, it will have been historically significant in terms of pure waste.