Are they any use? With Europe's black-box coronavirus apps it's hard to tell
https://www.reuters.com/article/us-health-coronavirus-europe-tech/are-they-any-use-with-europes-black-box-coronavirus-apps-its-hard-to-tell-idUSKCN2510MC
Europe's experiment in using technology to fight coronavirus has achieved some early successes: millions of people have downloaded smartphone tracker apps and hundreds have uploaded the results of positive COVID-19 tests.
