I bet GAF pedos determine who can be trusted, feel them out in PMs, invite them to Steam groups or something, and then slowly determine whether to share illegal shit or not. And I'd imagine even the types who aren't into child porn wouldn't snitch on those who are - they've already proved that their views on this shit are pretty ugly as is ("no one is getting hurt/she's actually 15-16 so it's not a big deal/etc").