Aren't NFTs literally the cryptocurrency equivalent of tulips? The tulip mania died down because you can trivially replicate tulips. One can argue that Bitcoin is an overvalued currency because the actual economy backing it is absolutely tiny but there is at least some nugget of value in there, even if it is only $100 per Bitcoin. It's enough to at least pretend but with NFTs you have taken the one final step that makes them meaningless.