https://www.vice.com/en_us/article/4ayywp/refusing-to-use-coronavirus-contact-tracing-app

More than 280,000 people globally have died from COVID-19. As countries begin to contain the pandemic, and consider slowly reopening their economies, more than twenty governments are developing and pushing citizens to use apps designed to detect when someone gets in contact with an infected person, and track how the infection spreads.

After years of privacy and surveillance scandals, from the Snowden revelations to Cambridge Analytica, people are wary of such apps. A recent survey found that more than half of Americans would not want to use this kind of app, and a contact tracing app will not work if more than half of the population refuses to use it. A recent study from Oxford estimated that for contact-tracing to be effective, at least 56 percent of the population needs to use the app. On top of it all, it’s not even clear how this kind of app would really help.