Market forces are broad and operate at every level of power, hard and soft.
I believe that's what your parent comment was actually talking about. I read it saying the people in power on paper was the previous board, and the people actually in power were the employees (which by the way is an interesting inversion of how it usually is)
that's because most of those people did not work for the mission-focused parent OpenAI company (which the board oversaw) but it's highly-profit-driven-subservient-to-Microsoft child company (who were happy to jump to Microsoft if their jobs were threatened; no ding against them as they hadn't signed up to the original mission-driven company in the first place).
it's important to separate the two entities in order to properly understand the scenario here