A photograph of a short-eared owl mid-flight was the last Instagram post biology professor Carl Bergstrom shared before announcing his departure from the platform Jan. 10.
In a word, audience. I'd prefer it if everyone went with Mastodon, but the audience on BlueSky is orders of magnitude bigger. I cross post to both, but only because I don't trust BlueSky not to do exactly what Twitter and Meta have done eventually.
I think there's a fairly serious problem for large accounts on mastodon but I will never have one so I can't quite understand it myself.
Something like dealing with replies / scolds without spending all day blocking is too hard.
It doesn't help that "no algorithm" means "show first reply at the top" so quick replies can dominate comments.
The bit I don't understand is why this is fine on blue sky. Is it just different users? I can't quite believe that but I can't see why blue sky would be less annoying.