I mean, this is an understandable argument, but the moral harm of the government broadcasting the weather data they produce anyway for free is not so great (in my opinion) that it should be stopped.

If DWD has an API, I guess somebody should just put up an open source app on F-Droid, and maybe somebody will pay to put it on Play. I don't know about iOS anymore, last time I made an iOS app it was kinda something you would only do if there was money in it.

I agree somewhat with the general argument, but I don't think the courts should be pushing for "peak neoliberalism" at any cost.