The point is DWD is tax financed service to process weather data and to distribute it to the once that need such weather data. As it is pay by taxes, the data is distributed free of charge. The are many services, even the one you just mentioned, that uses exactly that data to distribute it further. DWD build its own app to inform about severe weather conditions as this is also allowed by DWD. Then DWD added just the regular weather data to the exact same app including rain radar and such things, that OpenWeatherMap for example does not provide. DWD got sued for this by the companies who using the exact same DWD weather data and selling it to the customers either by adding ads or by subscription.
By the way OpenWeatherMap is providing just basic weather data that is actually allowed to be included into the app for free. We are talk about much more detailed data.
The point is DWD is tax financed service to process weather data and to distribute it to the once that need such weather data. As it is pay by taxes, the data is distributed free of charge. The are many services, even the one you just mentioned, that uses exactly that data to distribute it further. DWD build its own app to inform about severe weather conditions as this is also allowed by DWD. Then DWD added just the regular weather data to the exact same app including rain radar and such things, that OpenWeatherMap for example does not provide. DWD got sued for this by the companies who using the exact same DWD weather data and selling it to the customers either by adding ads or by subscription.
By the way OpenWeatherMap is providing just basic weather data that is actually allowed to be included into the app for free. We are talk about much more detailed data.