The reason is the tracking of the torrents by the 3 letter agencies and that copyright mob. They get everything just by downloading and looking at the torrent traffic.

Private trackers are elitist to keep the assholes out.

Terms of entry cause them (3 letter agency types) to lie in order to gain access, which makes any attempt to use the sites data in court, inadmissible.

I get it, they have strict rules, much like any civilised society that wants to keep the riff raff out