You keep your mouth shut about material property of Google. E.g. don't post code, and probably don't give details about code that hasn't been made public. Sure, this area is not clear and can also depend on one's internal position in the company, but it's important to separate moral hazard from legal hazard.
As far as one's opinions go, and in particular how the company made you feel, that's not paid for. A severance agreement might outline some things, but again that's legal hazard and not moral hazard. There are certainly some execs and managers who will only want to work with really, really loyal people, who throw in a lot more for the money. And some execs will pay a lot more for that... e.g. look at how much Tesla spends on employee litigation.
As far as one's opinions go, and in particular how the company made you feel, that's not paid for. A severance agreement might outline some things, but again that's legal hazard and not moral hazard. There are certainly some execs and managers who will only want to work with really, really loyal people, who throw in a lot more for the money. And some execs will pay a lot more for that... e.g. look at how much Tesla spends on employee litigation.