Bitcoin has merit. There is a finite amount of it, and that's it. There is no more bitcoin after the whole 23? million are "minted".

Alt-coins/shitcoins are grifts, they can be worth what people want to pay but anyone can spin up a new coin. And they do. Pump and dump for chumps.

NFTs are the same. Anyone can create an NFT for whatever. There is no value in it whatsoever.