Based on data from https://fedipact.veganism.social/ it seems that the majority of instances blocks threads.net. I'm sure there's Lemmy instances with either approach that have slipped through the cracks as the list is a work in progress.
The percentage of users doesn't correlate to instances as the biggest instance on the Lemmyverse has roughly 3x the users of the second largest, a NSFW instance, 4x the users of the biggest "niché" instance and 5x the users of what I see as the second largest general purpose instance.

14 Comments
1984@lemmy.today · 24 pts · 2y
Someone posted this in another thread and the stats are genuinely misleading here. All the super large instances are federating with Meta, with like 90% of the users.
registrert@lemmy.sambands.net · 29 pts · 2y
I'd be happy to update it with more correct information if you can find more accurate numbers.
From https://fedipact.veganism.social/ the largest instances in order of active users are:
DrRatso@lemmy.ml · 9 pts · 2y
They are probably mean including mastodon, which is larger and generally federates with threads
kersploosh@sh.itjust.works · 12 pts · 2y
It's interesting that Mastodon instances are trending in the opposite direction of Lemmy instances. Most are staying federated with Threads. I wonder if that's simply indicative of the strong anti-corporate culture on Lemmy, or if there's more to it.
RandomStickman@kbin.social · 19 pts · 2y
Maybe that and the creator of Mastodon actively rolling out the red carpet for Zuck
thenexusofprivacy@lemmy.world · 1 pts · 2y
Yep. Meta's convinced him that this is a huge victory for Mastodon -- and a good way for him to achieve his goal of getting Mastodon to 100,000,000 users.
lemmyvore@feddit.nl · 2 pts · 2y
It's also interesting that nobody's asking "how is Threads federating with Mastodon/Lemmy?" All the focus is on the underdog but shouldn't we pull our heads out of the bubble and give some attention to what the big dog is doing?
callyral@pawb.social · 1 pts · 2y
They're probably using ActivityPub?
Dirk@lemmy.ml · -4 pts · 2y
They're just stupid.
BiggestBulb@kbin.social · 6 pts · 2y
Is kbin.social still going to federate?
Chozo@kbin.social · -3 pts · 2y
I hope so. Preemptive defederation is a stupid idea.
davel@lemmy.ml · 5 pts · 2y
First as tragedy, then as
farcekbin.socialAmelia@transfem.space · 6 pts · 2y
And mine is one of them
garrett@infosec.pub · 5 pts · 2y
With how bad Lemmy federates across other platforms, even those still federating won’t be seen on Threads lol