Spambots advertise their product. They usually flood the whole chat mentioning some new penis cream or something like that. They usually don't last very long. You know when you go on Omegle and when you say something, the other guy goes like "HA HA OH WOW, BUT YOU KNOW WHAT IS REALLY GOOD FOR YOUR BELLY BUTTON? THE NEW BELLY BUTTON CREAM!" and then they log off.
I would be bold enough to say that Toribash doesn't really have a spambot problem. It's either that, or I live under a rock.