Best theory I've heard is that the board sought to distance themselves from Sam because they got advance warning of the big copyright infringement lawsuit that just dropped today.
In other words, what if they knew the suit was coming and sought to make Sam the fall guy by firing him sort-of-for-cause ... but they're stuck, because they can't explain what the cause reason was, without admitting the board was aware of the misconduct.
https://www.semafor.com/article/11/21/2023/openai-microsoft-...