sorry to be pedantic, but it's literally not multi-level-marketing? Specifically, it's missing the multi-level part. Your upline isn't getting $$$ when you sell a NFT. I suppose you can make the argument that if you then take the money and buy more stuff, then your upline gets paid, but that describes most distributor arrangements. Come to think of it, there isn't really even an upline. It's just a network of artists…
Pyramid and MLM are related concepts, and usually MLM is pyramid. That doesn't mean all pyramids are MLMs though. Same applies for other types of scams or structures.