The point still stands, the board does not have "investors". Microsoft knowingly donated to the for profit entity of the non profit. Open AI isn't a PBC, it's a 501c non profit. So the board can act that way, without the knowledge of the investors.
That being said, this is a case of biting the hand that feeds you. An equivalent would be if a nonprofit humiliated its biggest donor. The donor can always walk away, claiming her future donations away, but whatever she's donated stays at the nonprofit.
Watching what? A 501c3 being publicly pressured to make key governance decisions for the commercial benefits of investors in the 501c3's for-profit indirect subsidiary rather than the board's good-faith interpretation of its charitable purpose?
That being said, this is a case of biting the hand that feeds you. An equivalent would be if a nonprofit humiliated its biggest donor. The donor can always walk away, claiming her future donations away, but whatever she's donated stays at the nonprofit.