Just because the company is doing shitty things doesn't mean that every engineer does.

Plus, imagine how it could work in reality. You finally got your place at Google. You know what the company is doing. And at some point you are asked to work on one of these grey things. What do you say, that it's immoral? If so, where exactly do you draw the line? Who is to decide what's still acceptable and what not? You've known for years that Google is tracking everyone. Moreover, most of it is perfectly legal. In any company, whenever you say "no" to your manager you need to have a solid ground. I can't imagine anyone even starting such a conversation.