A bit of background on µTorrent, it was written by a guy named Ludvig Strigeus (creator of well-known FOSS projects like OpenTTD and ScummVM), and was free albeit proprietary, with no adware/spyware but simply a lean (in resources) yet featurefull client which made it the de facto bittorrent client on Windows.

He then sold µTorrent to Bittorrent inc (and went on to co-create Spotify), and from there on µTorrent has gone downhill as Bittorent inc are going for bundling adware/spyware in order to get a return on their investment.