This is an extraordinary claim and it requires extraordinary evidence. There is nothing in Altman’s behavior current or past to suggest this was anything other then a money making grift. The easiest explanation for his betrayal is that he was simply lying.
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I'm not fan of Altman but the financial angle doesn't make much sense when he doesn't have equity in OpenAI
There's some indirect exposure and potential of being granted significant equity, but his actions don't read as being for his own wealth
As an example, he walks away with nothing in the very plausible timeline where he was fired but not then reinstated