How does it matter if you sell your art as NFT or I sell your art while pretending to be you? An original Mona Lisa sold by an art thief is still Mona Lisa and

How does it matter if you sell your art as NFT or I sell your art while pretending to be you? An original Mona Lisa sold by an art thief is still Mona Lisa and is as valuable as if it was sold by a gallery. Buying Elon’s tweet NFT from a rando pretending to be Elon still gets you Elon’s tweet. Blockchain doesn’t care. And if people don’t care about the bytes, then what’s the reason for buying NFTs? Illiquid currency one has trouble using anywhere else?