And yeah, you're right about Reddit. Problem is, they're in between a rock and a hard place.
On the one hand, users want more freedom than on most traditional community sites. There's a certain expectation that communities nowaday are basically the equivalent to a free speech zone in a local park, where near enough anything goes. And because social networks originally were really hands off about what people posted, that's become the baseline now. You need to claim your site is free speech friendly to get people using it.
On the other hand, true freedom of speech is impossible on communities owned by companies and individuals. You'll get a lot of material that's extremely disturbing. Advertisers won't touch the site with a ten foot bargepole. And to some degree, a lot of normal users will actually be put off when the site draws in the less savoury users that freedom of speech often attracts most.
So Reddit is kind of screwed. They either have to say 'there's no freedom of speech here, here are acceptable standards' (and watch their audience evaporate) or say that there is freedom of speech still (but have their audience gets more and more angry when stuff gets removed anyway).