Google knows where we are, and so do advertisers
One of the most disappointing changes in Android recently is that any network-assisted geolocation plugins must now be installed as a system app, not a user app. That means that even if you use LineageOS where most Google stuff has been stripped out, getting a GPS fix through network assistance still sends data to Google servers. Only a tiny minority of users are comfortable working with the command line and will install e.g. Mozilla geolocation to the right place on disk. Just one of many changes Google has pushed into AOSP that end up strengthening its own monopoly.