Earlier quoted context omitted.
f-droid website says "This app promotes or depends entirely on a non-free network service" -- whats that all about?
You should use peertube instead. Saddly there isn't much content there, but try to look there first and reward those who post there with your eyeballs.
What might be useful is some way to use PeerTube distribution on any .mp4 file. Peertube is only a caching system, not a replicated hosting system like BitTorrent. You have to host one copy of the file somewhere. You should be able to put that master copy on any low-end web server, generate a Peertube URL for it, and let Peertube spool it out. Peertube works by mooching bandwidth off the people watching, so as viewership goes up, so do serving resources.