League of Legends (LoL) also comes with pmb.exe Pando Media Booster. Apparently this comes with most online gaming installs. The problem with Pando Media Booster is that it continues serving in Bittorrent fashion the install files even after the software is installed. This can greatly impede your internet performance. The nice thing is that after you've installed the game, you can easily uninstall Pando Media Booster and future updates will continue without any problems.
I wouldn't have a problem leaving this on if Pando Media Booster was configurable in such a way that the producers of these games could control with Pando Media Booster was actually sharing.