They have ownership of that particular NFT, in the same way that you can own a baseball card.
No, buddy. Either you're completely deluded or you really don't understand what you're saying. That baseball card I found in my old closet in my parents' house two weeks ago while visiting? I own that. It's a real, physical thing. I could sell it, I could keep it, I could set it on fire. My ownership of that card in no way requires a group of people to get together and collectively agree I own it. My access to that card only requires me to physically walk over and pick it up. If you were to try and take my baseball card, the law would punish you. None of that is true about NFTs.
With NFTs, the company can give up some ownership but allow resales (which most don't these days), which is another revenue base.
Except they don't. They might tell you they do, but they don't. Because when they shut down their servers, it's all gone. You don't own anything. You just have a receipt. Same as I do for my ships in Star Citizen. Which I can totally "sell" and transfer to another player. And my ships will be just as gone if CIG decides to shut down the servers or just ban me because they didn't appreciate my Chris Roberts/Elon Musk slashfic. You are deluding yourself by thinking any of this is different or real. You are being swindled, and you've swallowed the bait hook-line-and-sinker.