> A group called “jailbait” — it contained provocative images of teenagers — led to a ban of “suggestive or sexual content featuring minors” in 2011. The company also shut down a group called “beatingwomen,” which glorified violence against women. Last year Reddit banned two so-called alt-right subreddits for repeatedly posting personal information that could lead to harassment. It took no action, though, against a subreddit organized around gun sales, which drew scrutiny after a 2014 Mother Jones article suggested that some arms dealers sought to exploit a federal background check loophole.

https://www.newyorker.com/magazine/2018/03/19/reddit-and-the... also goes into it.

> In September of 2011, Anderson Cooper discussed the subreddit on CNN. “It’s pretty amazing that a big corporation would have something like this, which reflects badly on it,” he said. Traffic to Jailbait quadrupled overnight. Twelve days later, after someone in the group apparently shared a nude photo of a fourteen-year-old girl, the community was banned.

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The Apple / Tumblr issue is much more recent (did Reddit even have an App Store app in 2011 - the version history doesn't go back that far).