The fact that they even have internal discussion boards is a cultural choice of Google. Most companies don't have such a thing. But culture is always implicit, not explicit. If Google had traditions of encouraging those types of discussions and Damore engaged with that, it's still on Google for promoting that atmosphere. The fact that it got leaked and then there was blowback and the leadership reacted to that blowback in the way they did signaled a cultural shift to Google employees and prospective Google employees. That's okay. Corporate cultures change sometimes. It's unknown whether that will be good for Google in the long run or not, but just because some companies think that such a discussion is not ok does not mean that it wasn't implicitly acceptable at Google when Damore did it.