RTLFC
1.) In the US, freedom of speech does not apply to a private organization, club, or company. EA / Mythic can restrict what you say in the game. Other countries may have different laws.
2.) Many of the private web sites / fan sites I have seen have discussion boards that are lightly moderated, or not moderated at all. The result is some post containing pictures of / links to pornographic or offensive material, and / or exploits. Your guild page may be on the up and up, but are you sure that 100% of all post made by the members are clean? Some guilds sites are very bad, many are clean…do the GM’s have time to check them all?
3.) Freedom is an illusion. What you consider freedom is based on your perception of the world and the cultural and moral bounds you live in. Freedom of speech is similarly governed. A good read from Google is at Stanford’s web site:
http://plato.stanford.edu/entries/freedom-speech/