I drew a different conclusion from reading the parent. The issue with "your vote doesn't matter", however true it may be, is that the decision not to vote results in removing yourself from the decision-making process, giving more power to those you oppose. That seems to be specifically what the parent is arguing not to do, as someone who has quit no longer has any power within the organization.
That may be true in a closed system, but Google is not a closed system, and that person can do any number of things outside of that system.
A person leaving is essentially a vote. It says I no longer have faith in the decision makers of this current group of leaders at google. You no longer will offer your value to them - that on its own, is most likely a loss (they would not have kept you if you didn't offer value.) On top of that, you add value to a potential competitor, or the EFF, or here on HN, where many have already switched to Firefox.
On its own, it doesn't mean much. But collectively, it could be devastating.
If not, oh well. My job isn't to ensure Google decides to be good and not evil. But I can determine if I will support something evil or not. And I choose not.
