>Instead of deciding over the complaint, the DPC has filed a lawsuit against Facebook and Mr Schrems at the Irish High Court in 2016, aimed at sending further questions to the CJEU.
Wait what? Why would they also sue Max Schrems over this?
So that they can refer the matters to the CJEU; although not in it's entirety, it is a procedural move to get all the parties (including Schrems) and their complaints / evidence in front of the CJEU to resolve matters that the Irish DPC feels they aren't in a position to or aren't willing to rule on.
From what I understand, that was some kind of mechanism to get their case in front of the court. They can't ask the ECJ directly, so they bring a case to a court that can. With Facebook and Schrems both being part of the case, they get to present their arguments to the court.
Wait what? Why would they also sue Max Schrems over this?