as the paper notes, ios itself doesn’t send much to google. it’s primarily installed apps that send data to google, and that’s primarily advertising related. google apps will additionally send all your location data to google.

moral of the story: don’t install any google apps and limit the number of apps you install.

I'm not going to ruin my phone experience just for that. Why should I care that my apps have telemetry for ads. It keeps them free.