I think instead instances should have every community. There isn’t one /c/books, every server has a /c/books. Your feed pages just pulls from the entire fediverse. No concept of “creating” /c/books, it just is.

Likewise, there isn’t “a” moderator. Every user is a moderator. Whether you vote, or delete the post out ban the user (from your view), your moderation opinions are published publicly. Your local feed algorithm sees everyone’s “moderation opinions”, if the consensus of the community is delete, then it just doesn’t show up in your thread

For each “moderation opinions” by a user, your client investigates their historical record to address credibility and likelyness of being a bot, a user’s history is his credibility