Might be a bit anecdotal, but I actually hired ex-Googlers for two different startups in the past. I would be hesitant to do it again.
They can indeed be good at building complex systems.
But when we needed simple systems, they would still build complex systems.
When we needed to ship product, they would still build complex systems.
Twice I had the experience where an ex-Googler would promise to rewrite a piece of software from scratch because it had a bad architecture, only to quit/get fired few months later (obviously the big rewrite was not finished by then).
They can indeed be good at building complex systems.
But when we needed simple systems, they would still build complex systems.
When we needed to ship product, they would still build complex systems.
Twice I had the experience where an ex-Googler would promise to rewrite a piece of software from scratch because it had a bad architecture, only to quit/get fired few months later (obviously the big rewrite was not finished by then).