[extra88]

Good point. It could be a short-term cache only only adds networks to longer-term storage if their relative location doesn't change over a period. Or, what I already wrote, they store it but with "hotspot," based on some heuristic, and therefore unreliable for location mapping.

[renata]

Android and Windows at least do support some kind of standard of marking WiFi as a hotspot or rate-limited, but I don't know how that works.

[extra88]

In iOS, you can set a WiFi network to Low Data Mode, macOS doesn’t seem to have an option like that.

I don’t think any of these are relevant to the subject of whether Google tracks the movement of hotspots.