Earlier quoted context omitted.
Map cells are the best solution available for 90% of locations, but they don't help with the 10% that's close to map borders. If an user randomly jumps between two map cells you know they live at the boundary. Generally there is often noise in GPS signals so it's likely that person will jump around. Furthermore, if a person uses multiple services, and each service has its own cell layout, you can check all services a…
Apple's solution to this seems pretty good, here's a snippet of the transcript from a WWDC 2020 talk: > It might be tempting to think that reduced accuracy locations are simply your true location with some noise added in. > But that is not the case. Simply adding some random noise on top of the user's true location is actually not that secure against someone who might wish to disambiguate the true location. Instead i…
Cool!