Some people have morals that make them oppose plans that they view as likely to economically harm many people. Unregulated, speculative investments like this are a zero-sum game and are going to lead to a lot of people losing their life savings on foolish investments and scams.

NFTs waste power right now. If 5 years from now they switch to PoS like Ethereum has been unsuccessfully trying to do for over a decade, then great—you can discuss it then, but it's a clear net negative for humanity at the moment.