Maybe this apply at startups but not to established and cash-rich companies like Google.
In the end, hiring is a transaction. Google does not have obligations beyond that, and neither do employees toward Google when there is a better transaction or when the terms no longer suit their needs.
Put more clearly: investors __do not want to invest__ in companies that are burning money right now, no matter their cash balance. Responsible, profitable growth is the goal. Your cash backstop is not relevant.