These responses seem kind of formulaic and bland. I don't know why but I expected something juicier - these are mostly just people realising they need to move on, for the same reasons most of us do.
Google has this aura about it that makes it seem like the pinnacle of career accomplishment, at least for software engineers. There are plenty of starry-eyed college students who are astonished that people ever leave Google voluntarily (unless they are going to Facebook/Netflix/${UNICORN}).
Agreed. I expected the reasons for leaving to be way more controversial. Most of them are basically just "I left to do something else". Only 2 of the people in that article left due to conflict, all the others just left for other jobs or hobbies.