The worst thing is the constant and malicious lie being perpetuated. You do not own an NFT in any legal or moral sense. The ownership is not recognised in any country, by any court or international body. All you have is an entry in a logical database that says you own it. But unless you have signed a contract with the seller transferring or licensing copyright then it as meaningless as you buying a certificate saying…
But also: proof of ownership of a NFT can be access to something else, that can be the "utility" defined by the NFT creator. Like the Board Ape Yacht Club gives access to parties. Others give other value add like YouTube revenue license rewards if the NFT shows up in an animation for example. (Quarter Machine) I think "utility" is where more of the potential is. It can be valuable with the people/company backing it and keeping their word.