So far, the only thing I'm fairly sure of is the "jacobappelbaum.net" and "@DieJakeDie" social media efforts are doing more harm than good, and were a horrible idea. They might make a not-extremely-guilty person look worse than he is, or make a horrible person somehow sympathetic to people who think he's "also a victim", but they don't help.
If the people he's exploited stay silent, then he can keep doing it!
Going through the legal system isn't much help in a community which is distrustful of it.
Complaining to the person in question, well, they've tried that, and it did nothing.
And if they don't group their stories together, then it's harder for people to find the accusations against him. There is strength, and more importantly in this case, credibility, in numbers.