Like, if I pay $5 for a jpg in some random gacha mobile game, I have bought into something that has A. A tangible purpose, and B. Cannot be replicated within the context of that purpose by someone else without themselves buying it. We can debate how good or useful of a purchase it was, but there's no question as to whether or not I "own" it (within the bounds of what digital ownership means) within that game.
People can't just simply right click and save my specific digital item for use in their copy of the game. The central authority (the game publisher) is what verifies the authenticity of my ownership.
The lack of central authority in these blockchains, given they are like that by design, is what makes NFTs fail. Because your "certificate of authentication" is only proof that you paid money, to someone. There is nobody to actually back up your assertation that you own any given thing, because there "is" no one who can. All you can do is have all your friends (or strangers on the internet) "verify" that you spent money on "something". No one can actually authoritatively declare you "own" it, or that whoever you bought it from even had the legal right to distribute it.
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