You can also have the RSS feed of Old Reddit bridged over - the feed link is the subreddit’s link with .rss appended at the end (e.g. r/Starbound). Through microblogging platforms (tested on Mastodon), you can go through either @owner@rss-mstdn.studiofreesia.com or @birb@rss-parrot.net to have Reddit’s posts shared in the fediverse. And on the threads platforms (e.g. Lemmy), only know about !meta@ibbit.at, where you can request feeds to be tracked. Can’t check lemmit.online from the other comment right now.