The clan I am in has several player moderators. About a year ago, there was a discussion about this topic when a member asked one of our P-mod members to come mute an auto-typer. At the time there was 3 P-mods in the chat who all stated that they are no longer supposed to mute auto-typers. The reason, was not that auto-typing had become legal, but that Jagex was claiming the game's anti-spam/advertising protection was sufficient to handle it. Player Mods really don't mute nowadays unless someone is severely problematic.