It's not that simple because these imbalances won't last forever. If the cost of renewable power remains low, it will encourage people in those regions to buy EVs, electrify their homes and businesses, relocate industrial usage to that area, etc.

If crypto-miners jump in to soak up that excess capacity, that cycle doesn't happen and there's very little positive outcome to show compared to all of those uses. 50 years from now, people are going to wish electrifying normal life had happened quickly but they're not going to be using a blockchain or glad that some speculators were able to make large returns for a few years.