I mean, there are now many other open source projects based on Android (LineageOS and e/OS/ for example) that are free from Google. If they can't control the operating system on your phone because it's free from their services, they can't control your device, track you and send you their ads...
I've been using e/OS/ for 3 years now on a phone made in Germany (Gigaset). There is always an alternative...