Obviously. That's not what I'm saying. What I'm saying is that someone can just as easily hack in and steal the key and forge new NFTs as if they were the artis

Obviously. That's not what I'm saying. What I'm saying is that someone can just as easily hack in and steal the key and forge new NFTs as if they were the artist. Which now, as someone else mentioned, you need a database of invalid NFTs. But if the artist's key is stolen, how does one create a database of "bad" NFTs? Now you have a bigger problem. Either you create a mechanism where a 3rd party can revoke an NFT or you create a separate ledger of "bad" NFTs. But how do you verify that new Beeble is Beeble and old Beeble is not Beeble. And now what if their key for signing the "bad ledger" is stolen? Do you see how recursive this whole tower of trust is? At least with a central database the maintainer could restore a backup and notify all parties that they were hacked. With a blockchain, you're fucked. There is no "undo".