In the vast majority of cases the purchase of an NFT does not convey ownership of the digital asset, only restricted rights to its use.
In reality an NFT is just a blockchain record containing a link to an object such as digital art, video, music, collectable, or in-game asset.
Your two sentences are inconsistent.
There are NFTs that convey legal rights, including full copyright privileges, or other benefits such as a legal right to redeem for physical goods.
There are NFTs that convey membership, or a transferable right to a composed piece of music, of which the holder may sell a specified number of unique “editions”.
All of these examples exist today. There are further unique cases, but they don’t fit your narrow cognitive framework, so you pretend they don’t exist, or dismiss them as irrelevant.
The fact is, you don’t understand the space or its potential.