When it comes to case law, they have to show intent, and the way they do that is they have to show their software is used for more than just piracy.

So, eg, if it's generic torrent tracker software, it's fine, because anyone can use it in a legitimate way (though it helps if someone actually is using it in a legitimate way), but if this is just for the site nyaa.si and no other trackers, they might lose this case if it goes to court.