I think I see. For the miner the electrical costs become prohibitive. My brother mines in Texas and that's pretty much what he says.
Headlines usually refer to 'sustainable' as having to do with the biological health of the planet, rather than the financial health of cryptominers. Hence the confusion the headlines were designed to generate.
That aside, I still think you hit the nail on its head in this article. At any time governments can step in and use their power.