One of the things I really like about working at Google is that they place a lot of trust in the judgement of the individual employees. I generally make it clear when I'm stating my personal opinion versus the "official" (for whatever that means given how informal the project is) one, but I don't have to carefully go through an approved list of talking points, run my HN by the legal department, etc.

Obviously, in certain situations, things get more official and formal. For example, when I went to Google IO to give a talk, we did have some documentation and coaching beforehand about how to handle various questions we might get about non-public stuff, other projects related to ours, etc. We are also expected to run any slides by legal before being publicly shown in a venue with a wide audience like IO. But, even then, the legal folks I've worked with have been a pleasure to talk to.

The company's culture is basically "We hired you because you're smart. We trust you to use your brain." It would be squandering resources to not let their employees use their own intelligence and judgement.