A lot of subreddits with the same idea as FatPeopleHate got swept up in their ban despite being run by different people and having never harassed anyone. A racist subreddit was banned out of some vague argument of being the focus of a lot of their time. (In other words, not for violating the rules.)
It feels very much like another instance of what intopieces just described, a transparent PR lie.
Except for that time where they attempted to dox the entirety of the Imgur staff which more or less precipitated their ban?
1: http://www.reaxxion.com/9552/reddit-and-imgur-staff-team-up-...
2: http://web.archive.org/web/20150610212104/https://imgur.com/...
And before you demand internal information, just imagine the witch hunt that would start if Reddit had released the evidence of such behavior. That would have caused even more harm, even against innocent bystanders.
The fact that they selectively banned communities based on their behavior and not their ideas proves they are for free speech, but it's not the "bastion of free speech" that some people interpret it as.
It was also pretty obvious that they were attaching the imgur staff.
That is why free speech proponents defend it so vehemently.
Because it is a slippery slope and any ground you give up - that becomes the new normal.