An analysis of nearly 500 Covid-related apps worldwide shows major differences in how much data they expect you to give up.
Source: The iOS Covid App Ecosystem Has Become a Privacy Minefield | WIRED
How many Covid-19 cases have been successfully tracked with smart phone-based exposure notification and contact tracing apps? Past reports say close to zero.
Considering exploding cases world wide, it appears we can add smart phone apps to the list of remedies shown to not work.