At my workplace it used to identify my location as various places within a 300 mile radius of my actual location correlating (at best) to places where our ISP had a footprint, but sometimes even places that it didn't. In any case I had never connected to to our WiFi with my phone, so it would have to be correlating the IPs of users who had. I eventually found a place where you could submit location services corrections to Google and now it gets within 100 feet of the building.
We used to joke about making a digital sign above our office door saying "Welcome to ___" which would use the location returned by the Google AGPS service.
Ever since "private relay" became available on my iphone (which I don't disable even when at home), whenever I get on google maps on my PC (so not going through the private relay) google maps always shows me in random cities hundreds of miles away.
Maybe this has been useful when introduced, but I'm not convinced it still is the case.
We used to joke about making a digital sign above our office door saying "Welcome to ___" which would use the location returned by the Google AGPS service.