This person is saying is that our economic system incentivizes profit, not that it mandates it for every agent. So while a few relatively well-off, well-educated, and principled Googlers can quit over perceived injustice, many people either can't economically justify such a choice, don't know enough to know that there's a problem with their work, or simply don't care and take the money over morals.

And furthermore, when was the last time you saw someone held to account for their job title? I've done that and every time it results in me alienating someone, because no one wants to lie to themselves and be forced to answer that they work at Raytheon because they think that's the way to do good in the world.