I mean, you can have a street full of iPhones - which I assume is a regular occurrence in USA, where people trust Apple - and still Google Maps on iPhone would guess well enough where you are. For example, I'm far away from the street and Google hasn't passed here recently, so my WiFi-based location is always way off (using Android). In my other home (and vacation home in another country) it's the opposite, because the cars have passed quite recently.

The story checks out so far for me... but I am kinda lazy to search for the source on this right now, so pls share if you have it.