My suspicion is that winning might have been a secondary goal. When OpenAI goes to IPO, all the testimony of former executives about Altman's behavior is going to be in the public record. A lot of that testimony makes OpenAI sound very chaotic and poorly run. That could prevent large institutional investors from wanting to take the risk.
It's not a bad theory, but I think you're making the logical man's mistake of trying to ascribe a lot of intelligence and strategy to a move because on the surface it's irrational. Not every villain's move is a mysterious Xanatos gambit. Sometimes billionaire assholes just do dumb stuff because they can and/or because they're full of small-minded hatred. Sometimes rich, powerful people do stuff that's irrational. Whe…
Really comes down to what you think his primary motivation is and what are just benefits.