Maybe on your instance - it's your loss. But admins have a choice - defed from them and lose access to all those users and having actual content worth looking at, or federate with them and actually grow your network into something that has enough going on to make people interested. As it is, I use Threads right now. I strongly prefer it to Mastodon. Kbin comes close, but has less content to idly scroll through. If no Fediverse site I use supports Threads, I'll keep on using it.