It would be so useful if I got a notification if I happen to have crossed paths with a person who later turned out to be infected so I can get tested too. This

It would be so useful if I got a notification if I happen to have crossed paths with a person who later turned out to be infected so I can get tested too. This will preempt so many asymptotic transmissions. Such apps are already deployed in china: https://youtu.be/YfsdJGj3-jM?t=303 https://youtu.be/YfsdJGj3-jM?t=303 We don't trust the government but what if it's just a private company who does it? Google already has your location info: https://www.google.com/maps/timeline https://www.google.com/maps/timeline They are definitely already using the information in aggregate to provide traffic jam info. Hell I am sure facebook already does this for suggesting friends too. On the balance of privacy vs social good, I don't think there's even much slippery slope left to protect.