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When I spun this instance of Lemmy up, I think there were only two other communities out there. Most of them were inactive, I think the high number of communities on this instance and the timing of it are what got us the increased visibility. I'm happy to work with admins/mods/users of the other communities on aggregating here, or at least facilitating cross-posting and sharing of resources.
Looking at the Feddit Community browser, I see these communities that aren't a part of this Lemmy instance, they all look pretty inactive so far: