It's simple - an app asks for background location permissions, then uploads all the datapoints and timestamps the OS gives them to their servers, which is then resold with "anonymization" that just replaces any personal information with an impersonal unique identifier.
It's simple - an app asks for background location permissions, then uploads all the datapoints and timestamps the OS gives them to their servers, which is then resold with "anonymization" that just replaces any personal information with an impersonal unique identifier.
That's the reason Apple/Google have clamped down so hard on location permissions since then. But even a degraded dataset is still valuable - https://www.eff.org/deeplinks/2022/08/fog-revealed-guided-to...