Fediverse

I'm new here, and have been looking into different communities to subscribe to, it's pretty difficult to decide which ones to subscribe to when theres often the same community on more than one server. (Example: internetisbeautiful on @feddit.de, @lemmy.ee, @lemmy.ml)

I'm not super savvy but couldn't they merge them and have the community hosted as mirrors of each other on both for redundancy? If I'm wrong, do correct me, again, not super savvy and also new here.