It's far from the only source of this data, and yes it can be used to geolocate you: https://hackers-arise.com/osint-tracking-the-suspects-precise-location-using-wigle-net/
I can't find a link now, but I remember seeing an article in the past about watching for what networks someone's laptop checks to see if they are available (saved networks it auto-joins) and using them to determine likely physical locations it is commonly located in.