leech

Originally meaning to be able to download without uploading. FPT sites many years ago would often have ratios where people would get a certain amount of downloadable bytes for every byte they uploaded. Sites that did not have ratios were said to be "leech" sites because you could download all you wanted without having to upload. Now a days most FTP sites are "leech" anyway. The term now more refers to any individual who is often into the piracy scene and does nothing but download files for cracked versions of software, movies, music and so on. They do not share what they have downloaded and don't provide help to others looking for certain files.