That the board is unhappy with his for profit and moat building charted path.
That this is about his sister.
That he pissed off microsoft.
That he did something illegal, financially.
That he has been lying about costs/profit.
That he lied about copyrighted training data.
I will add: maybe he's not aggressive enough in pursuit of profit.I won't like though it's the first thing that popped into my mind when I heard the news.