(alas, its shut down... but it used to be that if you looked at the 'moderated servers on a mastodon site you'd find parler in that list which was a modified mastodon instance that no one else wanted to talk to)
If your content is sufficiently shunned from the main instances/interchanges how discoverable would your posts be? Or would you go "ok" and accept the political or philosophical lean of the main site so that your content got syndicated/federated to others?
Obviously there's nothing stopping from some instances from creating closed or gated content, but the public facing ones with like 10-20 years of gardening input freely given by end users can never be taken away from the community, which is what's happening with Reddit and has happened with IMDB and countless others.
Does it matter though if Lemmie is run by such a group when you could potentially spin up your own instance where you enforce totally opposing values?