Is it considered acceptable to repost movies or TV shows from Usenet that are not available on any open torrent tracker? Obviously, the reposted content will be left unchanged and will have the exact filename as originally uploaded by the initial uploader.
It is piracy. Do whatever you want. Who cares if someone cares.
Will I get banned or something because the release is not mine but scene? What about private trackers?
Hmm, so it seems like a shortcut to get a good clout on private trackers.
You can though it's a bit of a roundabout way of doing it.
P2P releases typically come from private trackers, so you're having them go from private trackers --> usenet --> public/private torrents
Scene releases that leak to the public typically hit private trackers/usenet around the same time, so you're having those go scene --> private trackers/usenet --> public/private torrents
In others words anything you're seeing in usenet has already been uploaded to at least some private trackers & possibly public torrents.
Of course with public torrents anything goes, unfortunately with the demise of RARBG public torrent users are only seeing a fraction of scene/p2p releases. 1337x/TorrentGalaxy does cover some of this but they aren't covering nearly as much as the RARBG uploaders used to. So IMO if you're seeing a scene/p2p release that hasn't already been uploaded at 1337x/TorrentGalaxy then sure go ahead & create the torrent from your usenet download.
Unclear what you are talking about, you mention Scene but also quote my comment about P2P. Which one did you mean? They are totally different.
The scene doesn't do anything with torrents/usenet/etc., they are all about their own FTP servers. Yes, other people do have access to them & then spread those releases over to torrents/usenet/etc. but that's not the scene doing it.
P2P are the internal release groups at private torrent trackers. Most of them are not interested in uploading anything to usenet/IRC. Other people do grab those releases & then spread them elsewhere e.g. usenet/IRC.
It's probably fine, but some usenet trackers/provider explicitly state that you cannot do that. So check if it's mentioned in the "user agreement"