I don't navigate any dark alleys in order to perform piracy. I pay a service to host/run torrents, and I browse the available torrents through their associated torrent aggregator.

The only danger involved here is in the actual downloaded content. There have been a few codec/filetype vulns for video files in the past, sure, but one that deploys through the browser through a local Plex instance would be pretty interesting, to say the least.