The default license for Discourse content is Creative Commons, so you could do that. It is always nice to ask first, of course.
@spikerbond even if a bunch of people exported all their individual posts, wouldn’t that leave conversations in a weird, hole ridden state like a bunch of swiss cheese? What happens to topics people replied to, but nobody has a copy of the first post because they didn’t start the topic?
I don’t think this is feasible from a technical standpoint. If you want to fork the community, that’s your right, but I think you have to do it from first principles, starting from scratch.