This is not free speech in the strictest sense, every forum or site you use uses some form of censorship through rules/moderation. Though I'd say that Saidit has probably found a decent balance between the two in comparison to other sites. You can pretty much say whatever you want here so as long as you literally aren't shouting nigger over and over again. It's never as black and white as people make it out to be when it comes to freedom of speech and forums, because at some point you're going to get assholes that will use this freedom to stir the pot and just generally be nasty people. Some will use it to post all sorts of disgusting, inhumane shit.

You also have to take into account the server provider as most of them aren't as tolerant, they pretty much have you on strings if they threaten to close the site down as there aren't any better alternatives. The only way to ensure that this doesn't happen is to find a very dedicated member that's willing to run the site on their own servers. Which will cost money and time and will generally just be a mind fuck to get done.