Which is why Apple takes the stance that the users device shouldn't be sending data to the mothership at all, if it isn't absolutely necessary.
Compare Apple Maps and Google Maps.
Google initially hoovered up all your location data and kept it forever. They learned from Waze that one use case for location data was keeping your map data updated.
Apple figured out how to accomplish the goal of keeping map data updated without storing private user data that could be subject to a subpoena.
> “We specifically don’t collect data, even from point A to point B,” notes Cue. “We collect data — when we do it — in an anonymous fashion, in subsections of the whole, so we couldn’t even say that there is a person that went from point A to point B.
The segments that he is referring to are sliced out of any given person’s navigation session. Neither the beginning or the end of any trip is ever transmitted to Apple. Rotating identifiers, not personal information, are assigned to any data sent to Apple... Apple is working very hard here to not know anything about its users.
https://techcrunch.com/2018/06/29/apple-is-rebuilding-maps-f...