But also implemented incredibly stupidly. You are purchasing a url in a blockchain that points to a server a singular person or org owns in most cases. That gets rid of any point of the blockchain. With enough money I just buy that server, the image url you purchased is now under my control and now it’s porn or something unless you pay me to restore it. There were very few NFTs where the actual thing you’re buying is on a distributed blockchain rather than a pointer to a centralized and privately owned server. In programming terms it’s what rust does to prevent bad pointers with doc.rust-lang.org/…/ch04-02-references-and-borrow…