The fediverse offers a noncommercial alternative and that can be a draw. A "normal" Reddit user might not want to join us, but there will be users fed up with all the ads on Reddit, some of Reddits policies, tolerance of nazis and abuse and so on. Mastodon always was in the shadow of Twitter, a nice, but blew up when Musk started to destroy it. It offered a way out and that is worthwhile. And if Zuckerberg is starting to transform Instagram into a rightwing horror show, Pixelfed is there as an alternative. And if you want out of YouTube, PeerTube is working and ready for you.