It does have a lot with DMCA. Maybe not specifically the DMCA, but all the relevant regulations all around the world that are equivalent to DMCA because of copyright treaties. And yes, while you are right about Germany being more dangerous in terms of piracy (mainly because of copyright trolls), the relevant authority handling the case could very well be the USA court system.
I understand that receiving DMCA’s may cause fear, but keep in mind that online communities are very exposed to such action, and handling DMCA notices should be a part of normal operation. Someone always isn’t going to like what you are hosting and will try to shut you down legally.