I don't know what a GM told you or how you interpreted it, but my own conversation with a GM on the topic indicated there is zero rule that mentors must kick bots. We don't ever have to kick anyone. We have the right to in the case where they're harassing or spamming. Being silent is neither. They do rarely accidentally transmit "==" or "00000000000000000000000000" and then I kick them. Otherwise, I leave them be. Because yeah, any new player joining in the midst of all that kick spam just wants to be out of the crazy channel.