Looks like KBin has an edge over Lemmy now in terms of monthly active users.
It’s obviously a pretty silly thing, and is not in any way indicative of which project is “better” or more “long-term viable” or anything — instances of both federate with one another, and with the rest of fedi, so it’s all one happy family.
That said, it’s notable. KBin is a relative newcomer to the “Reddit-like fedi instance” game, and also does not have the tankie baggage.
Anyway, the more, the merrier!
KBin: https://the-federation.info/platform/184
Lemmy: https://the-federation.info/platform/73
Discussion on fedi: https://mstdn.social/@rysiek/110527049024028986
kbin is different software but is part of the fediverse since it follows the ActivityPub protocol. Therefore you can interact with kbin from any lemmy instance as long as they allow communication with each other.
EDIT: To add to that, although I have signed up at Beehaw, I have subscribed to many communities of other lemmy instances, and several magazines from kbin through the Beehaw lemmy instance.