This is a toothless, short-sighted, and self-serving philosophy that does not solve any problem.
I will explain, but first let it be known that I am a scorned Google user. I jumped on board the magic carpet of every Google service as soon as I could and loved it the whole time, but it has become clear to me that Google and my values no longer align. So I'm leaving.
However, telling the workers to "just quit" won't solve anything. In fact, it guarantees that the company will have a higher percentage of people you morally disagree with leading to, by your moral standards and actions, a more evil product.
Additionally, quitting because you disagree with company politics is the least meaningful protest you could levy. Inaction from the sidelines is just as damning as internal complicency. If you want to split moral hairs and feel Superior because you quit, go for it but don't pretend like you're a hero or in any way part of the solution. To be specific, Google won't reverse it's whole company plan and Buck the entire industry trend due to a _temporary_ uptick an employee turnover of a few percentage points (if that).
Change can come from internal activism and external Market pressures. Quitting is neither of those and actively contrary to the former.