It just sounds ridiculous to me, I'm with @Diddums on this one. Just sounds like money laundering and con artists wet dream.
Even if someone owns an Ethereum block chain of an nft, there is nothing stopping me taking a screenie of it or anyone else for that matter!
It's all silly and shouldn't exist. Cryptocurrency was never intended to be used as an investment in the first place.
Wait till all of it's finished being mined in the future and watch people drop it like unwanted puppies after Christmas to try claw back some sort of the value and return.
Sure make money off it if you can while the going is good, fair play. But don't rely on it, like any "stock" it could crash and burn at any moment or overnight.