I'm happy to see .world growing for this reason. There has to be a neutral ground for everyone. The gatekeeping of communities like Beehaw are fine for them, but in order for the lemmy to grow, it has to be shapeable by the community. Moderation screening, content rigidity, and walled gardens are antithetical to the type of social network that people are looking for as a replacement to Reddit. The community has to be allowed to make the place its own.
Edit: For the record, I'm perfectly aware they plan to refederate once they get their "moderation" tools. I just question what tools they deem sufficient to permit refederation. Moderation tools on Lemmy will be extremely powerful thanks to votes being public, and I don't trust admins of some of these instances to be responsible or fair with them, or to only use them on the most toxic elements. Petty, groundless shadowbanning and admin "curation" is going to plague Lemmy going forward, mark my words. That's why we need some neutral ground.