This is pure FUD and very dangerous. Firstly, you're talking about a different sub that what I linked to, grouping these together. The subs I linked are female led and moderated, at least BFHS.

Secondly, they also have large numbers of participants from a range of backgrounds with a range of motivations. The subreddits they are discussing tend to have 10s of 1000s of followers actively engaging in various levels of harassment, I doubt that's a single sock puppet.

Thirdly, do you have a source for anything you're claiming?

Finally, if what you're saying is true then someone is posting child pornography to Reddit. Regardless of his intentions we should be concerned about that.