I'm not affiliated with any of those "leeching services", but technically speaking that's not content theft, at least not directly from you. The content still belongs to the posters as per your terms and conditions. Besides, search engines are a core element of the net and GFY is just like any other site out there that gets cached by Google/Yahoo.
http://search.yahoo.com/search?p=sit...238&fl=0&x=wrt