If it was, companies like Microsoft and Apple would have acquired them a long time ago. The fact they decided to have a partnership means they have reason to believe the hype isn't real beyond what we already know today and they don't want to have to explain it to shareholders in the near future.
Why buy stakes and not the whole thing to block your competitors from making deals with them? This is big corp 101 and has happened countless times. It's even more likely if OpenAI is to be a $7T company in the future. Such an acquisition would be approved in a second... if the hype was real.
There's no such thing. Every company is up for sale, if you have the money.
Rare exceptions are old companies where the founder is still around and rejects deal after deal on pride. OpenAI is nothing like that, as the profit/non-profit drama exemplifies.
