[Sylos]

That's actively taking steps to block their tracking rather than just not using their service. And while technically, you can use uBlock Origin to block everything from Google, that would result in many webpages being broken.

You're also likely to be using Google's DNS (8.8.8.8) without knowing, because some piece of software decided to hardcode that DNS server.

And your friends have almost certainly already uploaded your data to Google's Android backup service and to WhatsApp's database.