Who, you will note, did NOT get in trouble for his public stuff according to michaelochurch's posts.

I was far from a model employee at Google - I continued to post on HN, I would challenge executives as to whether their actions were really in the best interests of users, and I would raise complaints I heard about elsewhere internally - and I don't feel like it hurt my career progression at all. I was promoted during my time there, and I largely got my pick of projects. When my old manager left the department, he told me that one of the things he and his superiors had really valued about me was my willingness to call things out that weren't working.

I do think that there's a right way and a wrong way to criticize your organization. As Ben Horowitz says, "Come from the right place." When I would say something negative about Google it's because I want it to be the best company it could be, and I'd often raise complaints internally rather than externally because that's where the decision-makers are. And if you want to be taken seriously, you also need to buckle down and contribute, and listen to considerations you may not have thought of. My manager said once that the folks who get fired are those who "Complain too much and contribute too little", and I can think of some prominent personalities on Hacker News who fit that description. Complain and contribute and you do fine.