If they can identify individual people breaking curfew, then yes that's way out of line. If they can estimate the percentage of people breaking curfew within an

If they can identify individual people breaking curfew, then yes that's way out of line. If they can estimate the percentage of people breaking curfew within an entire large city, that seems like important policy input. And there's a huge gray area in between. In actual fact, I'm not entirely comfortable with the "large city" granularity either. I don't want a city that is majority black to be treated differently using the excuse of their aggregated health data, for instance. I think these types of data collections need to be treated very seriously, requiring justification for specific uses, tracking where it lives and enforcing penalties when it shows up elsewhere. Because these data are going to be out there and used. If they aren't managed responsibly, they'll be sold on the black market and used in completely uncontrolled ways.