Perhaps your home router has a public IP. Google gets the location of the home router from just one Android phone connecting to it. I'm guessing.
But some home routers are behind CGNAT infrastructure: Then it's possible that TCP connections from the same browser can go through different public IP addresses.
Sharing the location helps Google to help users. And Google to target ads better.
But some home routers are behind CGNAT infrastructure: Then it's possible that TCP connections from the same browser can go through different public IP addresses.
Sharing the location helps Google to help users. And Google to target ads better.