The concern is that if the app just gives you a ton of alerts, because maybe you encountered someone in the street with the virus but it's unlikely that you hav

The concern is that if the app just gives you a ton of alerts, because maybe you encountered someone in the street with the virus but it's unlikely that you have been infected, people will simply ignore that alterts (or simply uninstall the apps), because you know, who wants to be quaranteened for 2 weeks because there is the remote possibility of having the virus? Maybe they do that on the first alert, at the second one they says who cares, I need to carry on with my business. One could argue that who recieves the notification should not quaraneen but get tested immediately, well we know that we don't have the resources to test all these people, in my country they don't even test people with symptoms if they are not severe enought, let alone test someone because an app says so. Also an app could give a false sense of security, that is particularly bad. The app only can say if you got in contact with a positive that also had the app, that quite frankly will not be common, first because not everyone has a compatible phone (in my country only 70% of people have a smartphone, also you need an updated phone to install the app, on iOS the APIs that will make it work are just being released in the next iOS beta), then the app will be voluntary and thus not everyone with a compatible phone will install it, for privacy concerns or other reaons (like not being forced to quaranteen for the remote possibility of having been infected). Thus I predict that maybe we are lucky if 20% of people have the app (that is compatible to what happened in the countries that already adopted it). And that is a percentage that make the app itself useless, because you have too few data.