There were a bunch that weren't even questionable. /r/jailbait comes to mind, and I know there were worse out there. It wasn't quite as blatant as Usenet used to be/still is (there were/are such lovely groups as alt.binaries.pictures.erotic.preteens, .early teens, and .boys). I haven't been on it in 20 years, so I have no idea what it's like now. I wouldn't even want to look because I'd presume it's all honey potted at this point (basically if you go there, everything you do is logged)

That said, the only reason Reddit banned them was that they were embarrassed in the press .