Original link which seems to have been taken down: https://www.vice.com/en/article/group-behind-steam-censorship-policies-have-powerful-allies-and-targeted-popular-games-with-outlandish-claims/
Update from the author:
Generally, the "sex trafficking" these types of groups campaign against is the non-existent QAnon variant, where those people are somehow trafficking millions and millions of (white suburban) kids into sex slavery in those countries for more of those people.