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Sam Altman appears to have been using non-disparagements at least as far back as 2017-2018, even for things that really don't seem to have needed such things at all, like a research nonprofit arm of YC.* It's unclear if that example is also a lifetime non-disparagement (I've asked), but nevertheless, given that track record, you should assume the OA research non-profit also tried to impose it, followed by the OA LLC (obviously), and so Paul F. Christiano (and all of the Anthropic founders) would presumably be bound.
This would explain why Anthropic executives never say anything bad about OA, and refuse to explain exactly what broken promises by Altman triggered their failed attempt to remove Altman and subsequent exodus.
(I have also asked Sam Altman on Twitter, since he follows me, apropos of his vested equity statement, how far back these NDAs go, if the Anthropic founders are still bound, and if they are, whether they will be unbound.)
* Note that Elon Musk's SpaceX does the same thing and is even worse because they will cancel your shares after you leave for half a year, and if they get mad at you after that expires, they may simply lock you out of tender offers indefinitely - which is not much different inasmuch as SpaceX may never IPO. Given the close connections there, Musk may be where Altman picked this bag of tricks up.