I have created some software that is capable of synchronising posts from Reddit to Lemmy. It's still a little rough around the edges, but it works as a such:
People can request new subreddits to be mirrored on !requests@lemmit.online. A bot (open source) will monitor the threads there, and if it finds a new request for a subreddit, it will make a new community on the Lemmit server, and add it to its monitored list.
It will then make periodic checks to see if any new posts (it doesn't copy any comments) have been posted on reddit, and copy those over.
Users can then subscribe to those communities from their own lemmy instance, and from there federation will pick it up. Or at least, that's the theory. At the moment, federation is not working awesomely, and that is where my lack of fediverse knowledge comes in. Maybe it needs more time, or something is not so properly - I don't know.
Furthermore: registrations on this server are closed. The point of this service is not to become a community on its own, but to deliver, ehh, "original" content to all the rest of the Fediverse while it's going through a ramp-up phase. Besides, the instance is running on a pretty small vps, and I rather have this thing manage itself. There is a !about@lemmit.online community for further questions about the project itself though, in case people want to discuss it further.
So ehm... Let me know what you think :)
This rases a question, if a bot creates a new community to replace subreddits, who will mod those communities to ensure that there's no bigotry, trolls, transphobia, homophobia etc.. running wild in the comments? Who will manage these?
Well, as the bot is the moderator, and as the person running the bot is responsible for it, I suppose that's technically the answer. But it's an excellent question if there are hundreds of communities created and people start posting comments in them. The easy workaround is for the bot to set each new community to read-only (by checking 'only moderators can post'). But, that would be a bit unfortunate as then that limits opportunities to easily chat about it. I suppose cross-posting by someone that wants to comment on it is a solution.