I know what you mean. I currently maintain one community with my other friends. It's new and not much people know about that community because mostly subbed videos there comes from another fandom. I am the one who write the "rules" and "how to join" post. Almost everyday a few people who don't read it just click join. I reject them and said what should they do but they got it wrong, I attach a few pictures as example and they still got it wrong.

I want all people who come there enjoyed the videos but because of their own mistake and their own ignorance they can't join the community.

Arashi's communities are strict, I know that from my experience in other fandom. Fortunately, I join Arashi community first so I know how to behave in other fandom.