Earlier quoted context omitted.
Do you normally use your friends' wifi? I do that when it's family, but generally not with my friends (don't do LAN parties anymore). With LTE, I don't need wifi.
Wasn't there a story recently about android phones still being tracked and tracking wifi hotspots even with wifi turned off? I believe location services still works pretty well even with GPS and wifi off. I would imagine if you walk into a home with google's AI doodads all over the place, you're gonna be picked up.
There was even a note about this feature in the privacy policy, IIRC.