I'm unsure what the value of this would be - considering all our posts are under some variety of CC-By-SA.
By design, our answers can be shared freely (which is antithetical to something being unique) and belong to the 'commons' of the internet. With *millions* of posts - there's rarely specific answers or questions whose 'ownership' (and I'm unsure what the ownership would mean here!) would have some specific, additional value on the open market. "I own the NFT for the infamous parsing XML with regex question!"
In theory I guess NFTs add artificial scarcity to 'virtual' items - but outside speculators, there's literally no value in NFTs. In the case of posts here - they don't really map to virtual versions of physical objects as many NFT subjects do. Posts on a site are not collectable (unlike a physical piece of art, and an NFT as an analog to that, or a trading card and its NFT analog)...
As such, I don't particularly feel that its a logical fit for what we do here.