[dillondoyle]

It was probably adtech companies.

There are a bunch who basically pay apps to use their api and then take the data.

Apple was right to kill that imho. IIRC that was foursquare's pivot

There is also lot/lon in programmatic bid requests, but I don't think they're super accurate or granular and lots of fraud. (could be wrong, just from my small experience buy side using DSPs seeing lots of lat/lons being smack in the middle of a city)

[1] https://www.safegraph.com/guides/mobile-location-data-provid...

[2] https://developers.google.com/authorized-buyers/rtb/geotarge...

[3] https://fixad.tech/wp-content/uploads/2019/02/3-bid-request-...