GameGod
The defining characteristic of these failed Reddit alternatives like Voat is that the communities that drove their growth were very polarized and often hateful. If your hate sub gets banned and your community moves somewhere else as a consequence, your platform is going to end up with a toxic core audience that are not inclusive and make it impossible to grow.
The growth of Lemmy (and Beehaw) being a reaction to Reddit’s shutdown of third party apps is exactly why it has a chance of taking off. It’s not a couple of fringe Reddit subs that moved to Lemmy, but rather users from all sorts of subs. The polarization isn’t there because 3rd party app users are a diverse audience that are probably representative of all Reddit users. This could actually be a huge problem for Reddit in the long run. If Lemmy and Beehaw end up having better vibes and communities with less astroturing, they’ll continue to draw more people in.