My suspicion/understanding of what went down is that the board wanted him out for funneling money to undisclosed side projects and failing to deliver on more central priorities, and then his personality cult revolted. Things may be turning against him internally, though, especially if successive iterations of their core product don't live up to Altman's techno-messianic predictions of its capabilities and/or financials sag to the point that having a job there ceases to guarantee entry into the Bay Area's financial upper crust.
The thing is that when all this went down, there was speculation that he was fired by corporate drones wanting to make Line Go Up, because a large percentage of the company's employees signed a letter demanding he return.
It depends on the crowd - the AI worshippers have and will always love him. Most people don't know who he is though so with a story like this you're getting a wider portion of folks responding.