Me too, I was scammed by Zoomtrader (in 2016). I had filed a complaint about Zoomtrader with the German police, and (unsurprisingly) nothing happened. Until now: I received a letter of the Prosecutor at Darmstadt asking me for further information about my case and whether I know about other victims of Zoomtrader. Since Darmstadt is in a completely different part of Germany from where I live, I presume that they are on a case against Zoomtrader (not on my case) and look out for more evidence or witnesses.
I have opened up an own thread about that http://www.forexpeacearmy.com/community/threads/court-case-against-zoomtrader-in-germany.55885/