I Line Chat group is effective if people join it. I have a ZD24 rule for Rancor we occasionally get new members that doesn't understand that Zero damage for 24 hours means you send 1 guy and die, I constantly sate it in guild chat and the message of the day space. But someone still don't get it and get booted basically for failure to read guild chat. I was told child accounts may not see guild chat, I don't know if that is true, but if they can't read guild chat to see the rules they will never be able to follow them and get kicked.