I remember what felt like 10 years ago we were griping about Google keeping search logs. At the time they didn't have a use for them, they just wanted to keep them around just in case.
So I never log in to google because I want to minimize how much they know about me. Of course they can still see my IP so who knows how effective this is, but at least I can try.
Except, wait! Then they bought youtube, and eventually merged the youtube and google login systems, so not only did you use the same account to log into both, but being logged into one meant you were logged into the other.
Now, youtube I was never that paranoid about the privacy of -- about them tracking what videos I watched. They could, but I didn't care much. So I had an account and I kept it logged in all the time, so I could see what my "subscriptions" had added recently and a few other useful things from being logged in.
But no, because google is so dedicated to privacy, if I wanted to stay logged in to youtube, I had to let google log every search I did under my own username. So to preserve my minimal privacy with google search, I had to stop logging in to youtube.
Those are the only two google services I use, but I bet there are similar stories for the rest of them.
So yeah. Google marketing a service based on "privacy"? No thanks.