Altman was on the board. He was not “just another employee.” Brockman was also on the board, and was removed. It was a 4 on 2 power play and the 2 removed were ambushed.
You also don’t seem to realize that this is happening in the nonprofit entity and there are no shareholders to fire the board. I thought OpenAI’s weird structure was famous (infamous?) in tech, how did you miss it?