Leechers

It refers to the act of giving yet providing nothing of substance in return, as it is named after the parasitic organism a leech. Leecher can be applied practially to peer to peer file sharing protocols, or networks (Bittorrent, Kazza Fast Track, Gnutella}, in which the leecher consumes bandwidth by downloading, yet has no will to upload or give back to a community. Particularly in Bittorrent, leechers are not actually increasing their performance, but possibly are decreasing it.