I don't know anything, but isn't Sam already rich? And, if OpenAI is in a position to capture profits in an expanding AI industry, isn't this the best possible time to lock-in equity for long term gains and trillionaireship?
For many people, sadly, one can never be rich enough. My point is, planning for both short term exit, and long term gains, is essentially the same in this particular situation. What a boon! Nice problem to have!