https://www.techdirt.com/articles/20200319/11091944132/governments-around-world-are-tracking-their-citizens-movements-to-prevent-spread-covid-19.shtml

In an effort to turn an unmitigated disaster into something a bit more mitigated, governments around the world are heading towards the "drastic" end of the scale to slow down the spread of the coronavirus. Cities and everything in them have been effectively shut down. Preventing the spread of the virus depends a lot on the voluntary cooperation of citizens to self-report and self-quarantine. Meanwhile, no one has any toilet paper. What a time to be alive, at least temporarily.

How do you enforce "voluntary" quarantine without filling cities with cops and/or soldiers? You turn to the tracking devices nearly everyone carries. Extreme times/extreme measures and all that, so every bit of location data hoovered up by carriers of phones and/or viruses is now apparently fair game.