ok, my last comment considering crypto
it is true that proof of work in cryptocurrency is an issue if nongreen electricity is used. but not all of crypto need proof of work (mining). There are cloud-based cryptos also and cryptos based on proof of stake (no mining needed). Meaning that NFT-s can be sustainable, is just the matter of the blockchain technology used ...
and about your concern about the environmental impact of bitcoin, I agree, it´s not perfect, but it´s still using way less energy than any current banking system ... https://hassmccook.medium.com/…ental-impact-f56b18014f64 (an old article, but just to present how bitcoin energy consumption information can be very misleading).
Blockchain could also save billions the government at the moment uses for our data protection (which is not and could never be saved as it could be if supported with the blockchain).
There are really a million reasons, how could blockchain be used for good, but it being a playtoy for millionaires is somehow putting a bad light on the whole concept of the blockchain.