On a fresh Android, at first boot, it will ask you if you want to sync stuff. I always choose 'no'. I then proceed onto the settings app, into 'accounts'. Ther

On a fresh Android, at first boot, it will ask you if you want to sync stuff. I always choose 'no'. I then proceed onto the settings app, into 'accounts'. There, I tap 'Google' and lo and behold: App-data, Calendar, Contacts, Google Fit Data and People details are all ticked to sync. I turn them off. Then I open the default browser. It logs me into Google, by default. I have to explicitly tell it not to. Google really really wants users to be logged in. That is my experience anyway.