the whole point of the app is to isolate people that have been in contact with positive cases before they become contagious. if everyone has the app, you won't

the whole point of the app is to isolate people that have been in contact with positive cases before they become contagious. if everyone has the app, you won't have an exponential growth. https://www.youtube.com/watch?v=gxAaO2rsdIs https://www.youtube.com/watch?v=gxAaO2rsdIs