Well, if you read the Terms and Condition (who reads em, right?) they actually don't allow cheating of any manner. The reason why they "allow" this is because there are probably so many people playing the game and there might not be that many moderators to deal with that sort of cheating. If the mods manage to overlook these, you can just report the hackers with concrete evidence (e.g. message logs/screenies ). Honestly, I really don't think they'll stop even if they get reported and banned for countless of times. They'll just end up changing their IP address and make a new email account. Rinsing and repeating.
>:3