Turbine did use standard BitTorrents at one time. That was before Turbine created its own P2P program called Turbine Down Load manager which did not work very well. TDM was replaced by Pando Media Booster which is another P2P method. The big advantage of TDM and PMB is apparently two fold:
Originally Posted by Thurallor
1) They are more secure because they are a closed community that allows Turbine to fully control what files are being shared.
2) They are a lot less expensive than the more secure BitTorrent services Turbine contracted with.
Turbine went away from standard FTP and some of these other download services because the dollar cost was excessive. Once F2P arrived people were downloading a million installers a year at a cost of perhaps 10 cents an installer - 100,000 dolllars a year.
I often wonder what kind of deal they signed with Steam in order to get Steam to host a zero cost installer for Lotro on the Steam download servers. I can't imagine Steam is paying the cost of all those downloads out of the whatever Turbine gives Steam for the Lotro products Steam sales.
Unless stated otherwise, all content in this post is My Personal Opinion.