The Mona Lisa is a physical "rivalrous" good, meaning if I own it, you cannot.

Digital goods are "non-rivalrous", so although NFTs can give a psychological feeling of ownership, I wouldn't say they make digital goods rivalrous.

I think digital NFTs only make sense in two ways: (1) psychological feelings of ownership, (2) perhaps a claim on something digital that _can_ be made rivalrous, for instance royalty streams. If these are subject to a smart contract that ensures one entity gets them, for example.