Now a bunch of people (including me) have signed an open letter protesting the investigation. The statement is quite short and to the point:

„The investigation against Netzpolitik.org for treason and their unknown sources is an attack against the free press. Charges of treason against journalists performing their essential work is a violation of the fifth article of the German constitution. We demand an end to the investigation into Netzpolitik.org and their unknown sources.“