https://www.techradar.com/news/the-best-free-alternative-to-utorrent

uTorrent was once a lightweight, open source alternative to BitTorrent's official software. Its speed and streamlined interface made it the tool of choice for music, movie, and game fans worldwide, but after its acquisition by BitTorrent in 2016, its popularity waned.  

Soon after the buyout, uTorrent became closed-source, preventing users from modifying its code to create their own variations, and contributing to its development. Advertisements also began to appear in its once-simple interface, giving former fans a further reason to look elsewhere.