Not necessarily. If it's your job to add notices to internal tools, and you've added notices to tools before without approval outside the engineers on your team

Not necessarily. If it's your job to add notices to internal tools, and you've added notices to tools before without approval outside the engineers on your team, then I wouldn't expect someone to get more approval than that in this situation. If I were Google, I'd give the employee a warning (one of three strikes). I'd tell them that they need approval from someone in a certain role (that's not an engineer) to post internal notices. Otherwise, it's up to the employee and their fellow engineers to make a judgement call about which notices are right to post.