alt Hacker NewsI could possibly see an argument for the owner being whoever paid for the tokens used, but honestly I think the argument for that is weaker than what you're suggesting; I'm merely playing devil's advocate here.
I don't think there's even a valid argument for any other ownership model, or at least none that I can think of.
I see the argument for whoever paid for the tokens. Or in the case of a free AI usage, the person who sent the prompt (or whoever they are acting on behalf of, i.e. the company they are working for at the time).
The primary issue being that it's all built on stolen data in the first place.