In te Netherlands, we have stickers that we cab place on our real-life mailboxes: "No ads. No unspecified recipient." The advertisers (mailmen) are not allowed to ignore this sticker.
Am I stealing money from advertisers?
There is no such rule for online adverts. So what is a parent to do?
By blocking them and obfuscating through clicking I am protecting my own sanity, and that of my children. This is my "No/No" sticker.
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.