I think such situation exists in almost all high-salary sectors. Financial - why I left Golman/Merrill Lynch/Wall Street stories, etc. People will try to explain everything from moral side. It's permanent dilemma.
For sure, when it's gonna be another 5th wave of financial crisis employees just move between sectors - from private to state (more secure). I'm not sure it's somehow related to IT at all or Google in particular, but this migration type really exists.