Reddit allows people as young as 13 to sign up. It is also one of the biggest sites for OF marketing on the Internet, and the site itself is probably at least 20-30% porn depending on how you measure it. This isn't even some hypothetical thing, you can go see people with 5 year old reddit accounts making posts like "now that I'm 18 I can finally show you my butthole."

To be clear here my crusade is not against porn on Reddit, it's against children on Reddit, and not because I care about guarding their virtue or anything, but originally because I thought reddit was better before it got infested with teenagers, and now because I want to see the site burn, so this seems like a good string to pull.