https://www.reuters.com/article/us-health-coronavirus-app-france/frances-covid-tracing-app-hard-to-link-to-others-eu-official-says-idUSKBN23N2KL

A coronavirus contact tracing app being introduced in France may not be able to connect with others across the European Union because it stores data centrally, EU Commission vice-president Margrethe Vestager said on Tuesday.