Sometimes when a season is popular, the copies with the most seeders aren't always copies at all. A fake torrent seeded hard enough climbs to the top of every search, which is exactly how it catches people.
When you aren’t paying attention you can pick the healthiest-looking result and find you just downloaded something malicious.
RoostWATCH doesn't commit to a release until it can see what's in it. It reads the file list first and asks a simple question: is there actually a video in here? If the answer is no, it cancels, deletes what little it has, remembers that release so it's never picked again, and goes looking for another copy. You don't get asked, and nothing lands in your folder.
Two more checks run alongside it. Cam and telesync rips are never grabbed automatically. And anything implausibly small for its claimed resolution is treated as suspect, because a 40 MB "1080p" episode is not a 1080p episode.
What it isn't: an antivirus. RoostWATCH checks that a release contains video before downloading it, but it won’t inspect the video itself.
Check the image here, the two best-seeded copies of this episode were both .exe files — 1093 and 818 seeders. RoostWATCH looked inside, found no video, and cancelled both before downloading. You can sleep well knowing that what lands in your download folder is a video, not something pretending to be one.