It's just the next level of the art business.
People paying stupid amounts of money for a stupid modern art picture or a "unique" one of a kind picture that is actually easily duplicated in every detail. The owner of some massively overpriced work of art didn't buy it for the picture, he bought it for the status of owning the "one"
People are now buying digital pictures or videos as "unique" artworks, when anyone can make an exact copy of it (and that they just duplicated to sell). However you get a listing anyone can see as it being unique and yours in this system and to some this is enough, you don't even own the copyright you just own this duplicate that you paid for.
"I own the NFT (unique, but not) version of Nyan cat!" <- this is what people are actually paying for, not the image but the public knowledge that you own this particular duplicate of this image listed as being unique (when it's not) that has billions of identical copies in circulation.
It's about status, just to say "I own this important thing" and everyone knowing it because of the database that says so. So you can pay millions for a Nyan cat gif or a small video clip of an NBA hoop or whatever. People are paying a lot of money for these things, and it's from people who have more money than they could ever spend and so it has no value to them.
I can go out today and buy an exact painted copy of the mona lisa for couple hundred / thousand bucks, it would be near impossible to tell the difference. However it's not about the picture, it's about owning "the publicly accepted one" and this is the same stupid mindset from people that desire more status in our stupid world.