Yes, the vulnerable here being, of course, the people who expressed non-cis gender identity online and were harassed and bullied into shutting up or (preferably) killing themselves, not the forum orchestrating these hunts.

Yes the point being this precedent can be used to hurt minority groups in the future even if it's for the sake of helping a minority group right now

Only if Matthew Prince decides to do that. Plenty of people published Malcom X speeches and not KKK speeches.