That would be great! And I'm sure there are people doing it. And if 2.3% of the US Power grid were dedicated to that I'm sure some people would be upset about it too
My basic point is I don't think there is anything morally wrong with Bitcoin miners using energy, even though this is a narrative that is very popular now. There are plenty of other valid criticisms of Bitcoin, but I don't think this one stands up to scrutiny.