pruwyben

This is an interesting idea. A few potential issues come to mind:

• In this system, each community needs moderators from each instance it is on. A small instance run by one person would face a challenge finding people to moderate potentially hundreds of communities.
• You mention that a user who doesn’t like their instance’s moderation can use a different instance, but this isn’t easy. There’s no account migration at the moment. This is more of an issue with the lack of that functionality, since there are many other reasons people would want to switch instances.
• If this was implemented, presumably it would require merging all existing communities that share names. There may be some big differences in the culture and content of these instances which could cause problems. You’ll find different content in the “memes” communities on lemmy.world, slrpnk.net, and hexbear.net.

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There are already Lemmy instances that don’t allow downvotes, like beehaw, so defederating seems kind of silly.