Community standards can include not 'milking' or not having an imbalance where one person or type of content is generally crowding out others. It is subjective whether that is happening but there is nothing wrong with seeing it as a platform problem the same way we see spam, plagiarism, etc. as platform problems. Neither those nor any other types of types of 'abuse' or 'flag-worthy' posts are defined on a list by a central party; everyone is a moderator and it is up to the user base to decide what is good and what is bad.