Lol yeah qBittorrent is known to exploit your device for crypto mining. They also bought uTorrent, which is also used for that. A safe download client is Deluge.
Where are you getting this from?? These are huge claims and I'm not sure if there is any evidence for either of them. qBittorrent is a highly trusted torrent client used by thousands maybe millions of people and you are the first person I have ever seen make these claims.
The encryption is very poor. As soon as you download a movie with a torrent the German government will send you a letter stating the movie you downloaded, with the exact date and time, and a hefty fine. The encryption is old and simple.
Firstly this doesn't describe how it can be used by hackers. Secondly I'm also not sure this is true either. My personal knowledge (mostly what I have heard from the piracy community) says ISP's can block torrent connections but they don't know what your downloading. You can get copyright infringement notices from ISP's when copyright trolls join the torrent swarm and log all the IP addresses in the swarm.
It seems like you don't know much about how torrenting actually works so please stop making these claims that aren't actually backed up by sources/evidence.
Yeah, there are many tracker sites with a vast community and there are applications which function as indexers which have a large community too. There are comments under almost every post.
This is interesting, thanks.