Almost! At the time of this post, lemmy.world has a whopping 25733 users and is growing fast.
Since my last post yesterday, it has added 4000 new users, making it the clear second-largest lemmy instance out there. Also quickly catching up to lemmy.ml’s 36000 (not taking new registrations).
beehaw.org (3rd largest) sits at 12500 users, partly because of more restrictive registration requirements.
Exciting to see all this growth!
kbin.social has 29K currently: https://kbin.social/nodeinfo/2.0 , fedia has 2.9K
fedidb.org has roughly accurate stats or you can check the nodeinfo url for each instance to get a count of only local users to that instance