Because of that a vast majority of old users have sticked to the last version before the takeover, which is v2.2.1.
But they also added advertisements and other features that does not stay true to the original uTorrent simplistic design. Since the original uTorrent project was bought over by the BitTorrent company, they started improving on the original design which is great in some cases. UTorrent v2.2.1 compatible WebUI Introduction
