How are you sure that it only works on Molten? I haven't tested myself but it probably functions with other WoW P.servers.
Also Molten Teleporter was here for a while, it was only then those bums that play BG 24/7 get annoyed by it and finally wanted to end this.
Plus Molten only takes action when their players are in danger, I know this because there was a hack that wasn't fixed/patched until one guy brought it up, then Molten took action.
In the case of oHack, Molten was able to gather data on what is used, making some hacks now bannable when used.