For a while; money isn't everything, and once they have enough of it, people will leave to chase whatever they're really interested in.
https://www.theverge.com/2017/2/13/14599186/google-waymo-sel...
https://www.theverge.com/2017/2/13/14599186/google-waymo-sel...
That said, the people Google was after probably didn't (really) want to work at Google, and needed convincing. Plenty of people prefer working on their own projects and couldn't care less about being employed by Google, but will forgo that for a "sure thing" payday (and there is nothing wrong with that). Business transaction like any other.