So my understanding is that a community created on a certain server (say lemmy.world), can be interacted with by any other federated server, and any interactions from those servers are synced to the original “true” community / server. How does it work if two servers both have a community with the same name? Each server is the owner of content created there, and then Lemmy is just merging the communities with identical names so posts from both appear under server.com/c/Music?
/c/Music on server A could have drastically different rules from /c/Music on server B, so there’s potential for users on both to see posts that wouldn’t be allowed on their server?
Not really, if someone from some-server join a .world community, that community is “copied” (cached) on some-server for all some-server users to use.
What happens is that people on some-server modify their local copy, then the copy is merged into the original on lemmy.world.