I wasn't aware that the German government had a "Data Chief" position. This article refers to the Federal Commissioner for Data Protection and Freedom of Inform

I wasn't aware that the German government had a "Data Chief" position. This article refers to the Federal Commissioner for Data Protection and Freedom of Information. Because of the federal structure, his authority is complicated with many important decisions based on the regional level (Bundesland). While some people do use Signal, most people, don't care. Many doctors communicate via WhatsApp, as it's just faster / easier.