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Redundant communities across instances
(lemmy.world)
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I think a solution could be to allow communities to merge voluntarily if the mods of both agree to. It would only work with instances that aren't blocked anywere. But users that would be subscibed to one would automatically be subscibed to all the merged commuities as well and you could post to the merged commuity from any of the participating instances. That would have the advantage that if one instance fails the community would almost seamlessly continue on the other instances.
That would probably be the best way to do it. Let the community mods agree which others they're "bundled" with, make it part of the metadata about each community, and then when someone subscribes to Bob1, their home server gets the list of related communities and adds them to Bob2 and Bob3 as well (but not Bobs 4 through 256, which aren't on Bob1's list)