I heard of this through comics fandom, some old DC Comics illustrator (not one I'd heard of) had sold some digital artwork for loooaaads of money.
While it is easy to copy, I guess it's similar to getting a gold trophy in a racing game - generally speaking, a silver or bronze will unlock the next track ... but they're not gold! You could always copy+paste a picture of a gold trophy, right? BUT IT'S NOT THE SAME!
That's how I see owning the "actual" digital copy, at least.
Some comics-people were bitching that trading NFT artwork is detrimental because of the datafarms etc (or something, I'm not that techy) but they're mostly D-Grade creators who no-one would buy exclusive stuff from lol, and also they seem to spend their lives on twitter, which in terms of data stuffs is obviously worse!
Apparently there's more to the power consumption thing than I thought, I'll look more into it later...