He either fucked up somewhere, he refused to do something "they" wanted or he wanted to do something "they" didn't want.
With the potential of what AI can and/or shouldn't do, I think it might be one of the last two. That's only because money is involved and it feels like greed is rampant.
Then again, maybe he's a pedo.
I'm not sure if this makes me a pessimist or a conspiracy nut.