I don't know why anyone would choose to work at Google anymore.
Probably still gets you an easy CTO title at a startup after 2-4 years at Google.
Not anymore, really. It was the case a couple of years ago but right now, for rank-and-file employees, Google downlevels heavily and targets around 80% of the market rate. For some reason, people are still flocking at their doors and because of high supply of candidates, they can afford to be both very selective and very cheap.