Google's phones track you in several ways that aren't through a browser. Want to see every place you've ever visited since you got your Android phone? Google has it and you can see it in your dashboard.
Google keeps location tracking a secret from you until you view your data, then once you go look at it, they start sending you monthly summaries of your travels.
Any don't get me started on the facial recognition in Photos. Take a photo of someone else's kids, and it will show you a helpful popup asking if you want to send the photo to the kid's parent.