[username90]

Google is mostly run by sticklers for the rules and has been for a long time (just ask Googlers about their code review process...). In practice most of the time individuals overlook transgressions, but if there is a formal complaint they don't. In this case the manager who hired the anti union org certainly got noticed about this since the notice popped up on their site, I'm pretty sure that person filed a formal complaint. And as Googles employee handbook says that doing things like this will get you fired she got fired, even though it was pretty innocent.

Similarly if someone made anti union messages pop up when you visit union sites I am 100% sure they would get fired as well, for the same reasons. You can talk about almost anything internally, (People like Damore aren't uncommon at all, the outside world just got hung up on him for some reason), just take your job and company code seriously.