Current breakdown at the time of this post sorted by the number of monthly active users:
A community to talk about the Fediverse and all it’s related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to [email protected]!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
Sometimes it is, say here:
https://fedidb.org/current-events/threadiverse
But you might as well say why isn’t Mastodon included? Kbin is a fundamentally different platform and architecture, even if the two are largely compatible (as is Mastodon, to a slightly lesser extent with Lemmy).
It is perfectly reasonable to look at the growth of Lemmy, think of it like quoting use of one flavour of Linux - Linux uptake overall is also interesting, but not the same.
The Linux distro concept is a great analogy.