a.k.a. the 90–9–1 principle. Does the Fediverse follow this rule, or are there more creators here as early adopters? Are you a creator, a participator or a lurker?
I think the 1% rule is true of large communities, but less so with small ones. It takes effort to find and join Lemmy, Mastodon and others, and use them, so only the most enthusiastic join at first. As it grows, the 1% rule will be even more apparent.