Yup. I once wanted the staff to publically post what rating they've in mind for the server and forums, but this was replied with stating that there's no rating and every content should be appropriate for children. No rating = G rating. Welcome to Discovery.
The game itself is rated T/PG-13, but the Discovery-mod obviously has higher standards in protecting those that shouldn't even have a copy and for that you're not allowed anything vaguely fun.