It is possible to do that past a certain level, and some people do. But I think the reason this isn't the predominant strategy is that there's a selection bias

It is possible to do that past a certain level, and some people do. But I think the reason this isn't the predominant strategy is that there's a selection bias at play. The kinds of people who are ambitious enough to get a job at Google are also likely to always want the next job up, or if that isn't going smoothly, to move up by moving out.