Another aspect to take into account is that you also have to enter your zip code. This piece of information is necessary in order to identify your location and detect which areas of Germany are being most affected by the virus. However, you can identify yourself with a nickname to keep your privacy intact at all times.
Corona-Datenspende is a good initiative that helps slowdown Coronavirus in Germany. Using this monitoring app, scientists can analyze your physical performance throughout the day and detect any signs of fever or other symptoms you may have.