Definitely true that the less people clear their cookies, the better it is for Google. But that seems like a nice side benefit. I bet the main reason they did

Definitely true that the less people clear their cookies, the better it is for Google. But that seems like a nice side benefit. I bet the main reason they did this is helping users avoid login screens. When you clear cookies, you obviously have to login to EVERYTHING again. It's a minor annoyance to me and you, but to regular users, hitting a login screen is like hitting a brick wall. "Hmm, what was that password? Did I use my Gmail or Yahoo? Is it my password with capital letters, or the one with 123 tacked on the end? Bah, I'll just never use this site again." Basically UX hell for most users, that's probably why they're really pushing Incognito. It's definitely good for the web if people reset cookies less.