I like Raddle - They already tried moving the /r/Piracy community there earlier but it didn't pan out. There's still a /f/Piracy community there that could be used as a backup in case something goes wrong here.
Technically someone could set up a Postmill instance (Raddle's backend software) anywhere & have their own community along with it. One upside with Postmill is that it plays nice with Tor, Raddle itself has a Tor address so does not need to be accessed on the clearnet.