My beginner understanding of NFTs leads me to think the polar opposite would achieve the goals of:
1. No ownership / everyone owns it
2. No limits to copying/editing/republishing
3. No royalties or payment of any kind
So maybe just posting your digital art online with an open-source license of some kind (usually that is for code) that indicates anyone can use it, copy it, do whatever they want with it and pay you no money/royalties.
People have pointed out that the actual art isn't in the NFT. This means anyone that knows how to capture a screenshot can duplicate anything they see online. This makes me think of stock photography sites. How do they enforce people aren't just copying/pasting the photos? Is this even enforceable/preventable? How would NFT's solve enforcement/prevention?
Since this is partly a thought experiment... one way for enforcement/prevention is for the digital artwork to be only used in closed source systems where validation with an NFT marketplace could be used. Websites are open source, maybe not legally but in essence you can copy anything that shows up on your screen, download images, etc. Closed source systems where people are paying to enter, like old school installable Enterprise software, could prevent or at least make copying extremely difficult and easier to trace. Another closed source system is video games - heavy on the artwork and lots of (much hated) micro-transactions to purchase cosmetic items.