This ban needed to be internationally, though. Pretty difficult to enforce on a global scale. And then it would only have a short term influence on the price of, say, Bitcoin, until enough “black” mining power emerges.

I would just relax. Bitcoin is not going to destroy the planet. In the long run it’s going to be a niche financial tool compared to the scale of Ethereum or other competitors (Cardano, Solana or Algorand). It’ll be the PoS enabled DeFi networks that are going to disrupt the banking business.