BitTyrant: making BitTorrent less fun for everyone (except you)
How does it work? Simple. When you start a download you start downloading a file, BitTyrant scans the upload speeds of other users and gives preference to those with higher upload speeds. Not only will you download the file faster by downloading from users with speedier uploads, but BitTyrant will reward users with faster upload rates by increasing your send rate to that user.
Real world example: You're downloading a file and are connected to a couple dozen users. Most of them are uploading at a rate of around 10 to 20 KBps. A few are uploading at 30 KBps or above. Those few are the ones that BitTyrant will give priority.
At first glance, this sounds like a win-win situation. You get your downloads faster, as do the users you're downloading from. But the problem is that this high-speed love-fest is cutting off users with slower connections. They were having a hard enough time downloading their files, and here you come with your high and mighty BitTyrant client just to ignore their pleas for peers to download from. The more users begin using clients like BiTyrant, the slower downloads will become for users with slower connections.