Irony is that if a significant portion of OpenAI staff opt to join Microsoft, then Microsoft essentially killed their own $13B investment in OpenAI earlier this year. Better than acquiring for $80B+ I suppose.
(but also a good chunk of the 13bn was pre-committed Azure compute credits, which kind of flow back to the company anyway).
While Activision makes much more money I imagine, acquiring a whole division of productive, _loyal_ staffers that work well together on something as important as AI is cheap for 13B.
Some background: https://sl.bing.net/dEMu3xBWZDE
For investment deals of that magnitude, Microsoft probably did not literally wire all $13 billion to OpenAI's bank account the day the deal was announced.
More likely that the $10b to $13 headline-grabbing number is a total estimated figure that represents a sum of future incremental investments (and Azure usage credits, etc) based on agreed performance milestones from OpenAI.
So, if OpenAI doesn't achieve certain milestones (which can be more difficult if a bunch of their employees defect and follow Sam & Greg out the door) ... then Microsoft doesn't really "lose $10b".
surely the really self-destructive gamble was hiring him? he's a venture capitalist with weird beliefs about AI and privacy, why would it be a good idea to put him in charge of a notional non-profit that was trying to safely advance the start of the art in artificial intelligence?