Rumors say that MAL has in fact existing rules. There is a great controversy surrounding this, the majority holds the opinion of "the rules" just being an ancient fairy tale. In reality, they just can't be bothered to read them hence the controversy despite the rules are displayed on top of each and every board in the forums.
MAL Forum RulesEdit
Despite MAL is primarly created for listing both anime and manga, the MAL forum rules explicitly stated threads that encourage simple listing are not allowed in which most users found to be quite ironic. The reasons why this rule have been implemented boils down to 2 reasons as justified by MAL local authorities. First, threads of this nature do not encourage any discussion from the users and second, most of the current listing threads were already been done to death in the past. By using these two reasons, they have concluded that these threads as being both redundant and a total waste of server space and hence, the formation of the said rule.