You overestimate the abilities of a group of semi-anonymous posters on a webforum. As far as our own reach of action is concerned, we've pretty much done all we possibly can.
The authorities have been contacted, but short of SWATting PK, we can't do anything to make them move faster. The best most forum users could do is file a tip and possibly spread the word if they considered that the superior course of action.
The only people on the forum with the ability to streamline legal action against PK/Marl are
@bigfluff and
@lainiwakuraa who are understandably not actively posting in the thread any further. What they have done is both up to them, unknown to us, and beyond KF's jurisdiction. For all we're aware, PK could spend the rest of 2018 publishing works without incident and be arrested in January for a months-long investigation. Or she could never see a courtroom. It's out of our hands.