But reddit is fundamentally built different than other social media platforms. Reddit is more like a collection of forums than a social media platform. The only thing that keeps people on reddit is the content and that can be moved.
On Youtube its the Algorithm and the Content Creators that keep people to use the platform. PeerTube and LBRY simply don't have the creators Youtube has.
On reddit people choose what to see. On YouTube the algorithm simply is wayy more important than on reddit.
If that would really be true than they wouldn't complain about being demonetized