Can anyone explain the effectiveness of such apps that are being used by some countries. If the apps help, isn’t there an argument of “life vs. privacy”, And if these app don’t, then why isn’t the effectiveness being challenged.

I understand the privacy advocacy but in matters of life and death (that is how a common man perceives covid-19), unless the effectiveness of Coronavirus solutions is dumbed down, this argument will continue. Till then people will see the app download as their contribution to this fight.