One can indeed copy the art and re-mint a new NFT but a single click on the user profile will reveal it’s not the authentic one.
e.g:
Click / Tap on the profile picture to see NFT provenance info
The paper/dollar object is now not fungible, and is a token. ;-)
I real NFT is the same thing, but with a tiny bit of cryptocurrency instead of the US dollar.
[Edit] - A did it, and made a blog post about it - https://mikewarot.blogspot.com/2022/01/whats-all-this-nft-st...