Why are you saying that ?
Allthough there is freedom of speech, we can't tolerate everything. We can't accept illegal things such as piracy, as well as racism and such strong insults against other people, or pornography considering that there are people under 18. If you like one of these and want to share, it's your choice, but do it somewhere else or in private with your friends. We don't want that on a public place where many people from many different cultures come to have a good time, it's really not desirable.
Forbidding advertisements or religion is more a matter of choice, okay, but because they allmost never bring interesting debats without becoming rude, it's better to exclude them as well.
We must record everything said in the playroom to have proofs in case we get a complain. Don't believe your e-mails, skype and MSN conversations, mobile phone calls, or all other modern communication means, are not logged. It's false. Even your internet navigation is logged. However it doesn't mean that everybody read everything: in most cases it's useless, and there would be far too much data to analyse.