Scamming through any means that does not involve an official trade method should be perfectly legal, considering the person that got scammed was enough of an idiot to do it. Doing it through trade tables can't really be called scamming unless you some how fake them out and they give you something for free or you swap ****. I have no idea of how these ******ed things work, but it can't really be scamming unless you swap out items or remove something at the last minute.