reddit is not one place. Each subreddit has its own moderation policy. Stolen naked pictures and overt abuse are one thing, but it is common in other subreddits (e.g. /r/europe) for posts or comments to be blocked just because they are critical of immigration. The mods might deny that, but it happens, because there are lots of mods, and people who donate a large amount of their free time to moderating a web forum are often not that bright or tolerant.