Only the free app was deemed anticompetitive. All the data is available: Geoservers: https://maps.dwd.de/geoserver/web/ (weather and warnings) https://cdc.dwd.de/geoserver/web/ (climate infomarmation) https://www.dwd.de/DE/leistungen/geodienste/geodienste.html (Overview)
You are also free to embed all the information from the website (maps, etc.) and there is also the raw data server: https://opendata.dwd.de/