Google AI ethicists and other researchers would be wise to recognize the delta between why Google ostensibly has them, and why Google actually has them. If they aren't tailoring their research to whatever Google executives want to hear, then they aren't doing what they're actually being paid for. And if they want to be honest researchers instead of corporate whores, they picked the wrong company to work for.
Would an honest climatologist last long working for Exxon? Would an honest cancer researcher last long working for Phillip Morris?