You might be interested in looking at something like Usenet News and NNTP where there is one and only one group with the name rec.games.roguelike.nethack ( groups.google.com/g/rec.games.roguelike.nethack ) and the contents of that group is federated out to every NNTP server that subscribes to it (not all do). Note that this is a different model and every server contains all the data for the groups that they subscribe to and may exchange those posts with any other server that they federate with (this also solves the “what if Lemmy.world goes down” problem where if the sponsoring server goes down, no one’s comments are exchanged outside of the instance they are on).