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First of all, the ActivityPub system is not suited to something like Misskey, which flows at lightning speed.
It was originally designed to connect blogs, small-scale SNSs, and wikis.
How can it handle the TL hell where tens of thousands of requests fly in per second?
It’s based on the idea that it would be nice if various small services could send each other updates, so it’s quite costly.



Also as long as all the forks keep using ActivityPub, shouldn’t it be okay?
yea but Misskey seems popular, even just misskey.io is huge, this would be a big loss for the Fediverse
https://fedidb.com/software/misskey?stats=1
I think the active user counts are being misreported too
misskey.io has 142 million statues/posts, way more than lemmy.world with 577k posts, it’s natural to have more microblog posts than threadiverse posts but 246x as many is a lot, idk if the lemmy.world number includes comments
Misskey has been around for a very long time. Also a lot of comments here would probably be their own posts on a microblog platform.
Don’t get me wrong, it’s not a good news by any mean, but it’s still not so bad if users who want to stay on the Fediverse switch to a fork.
Comments are counted separately, 5.67M for lemmy.world.