The story I heard before the PR spin that came from Paul Graham later (where he tweeted that he never fired him and asked him to choose between YC and OpenAI) was that he was asked to resign. I don't have an official source, I heard this from multiple YC alumni. I don't know exactly what happened but based on what I've heard and actually having interacted with Sam Altman, it seems most likely to me he was asked to resign (which isn't technically being fired) because he does weird stuff. He claimed to be a chairman of YC which wasn't true, he barred other YC partners from running personal funds while he did it himself, and then all the further similar behaviors we've seen play out at OpenAI. Maybe you're right, but it seems to me he was "fired" and later there was some PR to smooth it over.

https://archive.is/Vl3VR

https://archive.is/2mzD7

You don't know what exactly happened, but you stated confidently what happened.

You're right about that and that's why I'm providing additional context.

That doesn't address the substance of the claim though. What do you know that you aren't telling us about that situation?