You assume Nadella had the choice to switch companies freely. You have to keep in mind what it is like to be an immigrant in this country. Nadella gave up his

You assume Nadella had the choice to switch companies freely. You have to keep in mind what it is like to be an immigrant in this country. Nadella gave up his Greencard to switch to the H-1B program in 1994 to bring his wife to the US (and surely this unprecedented switch was some time in the making). Subsequently he relied on Microsoft to sponsor him once again for permanent residency. In that situation no immigrants switches employers regardless of their ethics. It often isn't even possible to make such a switch.