Lemmy.world grew by about 40% on the first day of reddit migration
Lemmy.world grew from around 51000 total users the moment 3rd party reddit apps started to shut down on June 30 to 71000 total users at the time of this post (July 1). That's a 40% growth in about 12 hours!
Tracking sites are lagging behind a bit, but so far lemmy.world is attracting the majority of new users since the reddit API shutdown.
The other big instances like lemmy.ml and beehaw.org are super slow today even though they're barely taking on new users. My hunch is people are scouting different lemmy instances and settling for lemmy.world because it's the most stable at the moment.