A pretty good portion of my social network moved, myself included. But it fizzled out really quickly and we all ended up back on Twitter.
Every once in a while I'd still get a notification from Ello that someone had followed me. It was always a porn bot, but the email notification was still nostalgic. A part of me is sad the site died.
And to Mastodon before that.
Remember when tech Reddit tried to migrate to Lemmy?
A hardcore handful of people migrate await from the Death Star and stay migrated (maybe a couple hundred medium accounts, and 1 or 2 bigger ones), but everybody else trickles back onto the Death Star eventually.
The only thing that works to get people permanently migrated away is complete enshitification of the existing platform (i.e. Digg effect). Partial enshitification isn't enough.