It's easier to get Facebook to be carbon neutral because they are a centralized institution, and it only takes a committed government to zero down on a corporation and force them to move to clean energy or pay a carbon tax.

With crypto it's too decentralized to implement either.

> who's the arbiter of what's "too much" power for a use case

Ultimately Mother Nature will be the arbiter. If people spend too much time arguing about politics instead of either lowering power usage or moving to clean energy, those people will be killed sooner or later.