Is a seedbox basically a torrent-focused media server? Probably worth submitting a PR to note this focus in the readme. And yes, I'm joking about the rewritten-in-Rust part. :)
To clarify further, a seedbox is a server used to continually "seed" (or share) any content downloaded to it.
Seedboxes are mostly used on private torrent trackers, simply because the majority require users to maintain a high seed/leech ratio. In other words, users need to upload more than they download.
No, it's just a box dedicated to "seeding", a server whose purpose is bittorrent.