IIRC, it happens when using G maps. Optional. Had 3 now. Perhaps relevant: I'm on chrome but tracking is blocked as much as possible.
Q1: How often do I use G search?
Q2: How much do I trust G?
Q3: Do I believe G respects my privacy?
G is built on surveillance, but they are taking a a beating in both public perception and potential governmental regulation over privacy. I think this shows they are worried.