The problem is that it’s worse for keeping topics centralized and fragments communities for external reasons. It’s antithetical to the idea of a link aggregator where you centralize all of your news if you need to use several of them to make it work. Defederation should be a last resort to protect the admins from legal action, content manipulation, or brigading, not because beehaw thinks open signups harm their safe space. Making the internet a safe space is how we got to this point with Twitter/Google/meta/reddit, and everyone wants to do it all over again to rebuild their echo chambers.