I quit as the top mod of /r/StarTrek in 2021 in protest against Reddit’s platforming of vaccine disinformation subreddits. Then in 2023 during the API protest, myself and several of the remaining mods (including mods from /r/Risa and /r/DaystromInstitute) started StarTrek.website.
The consensus I’ve seen on Lemmy has been largely “we don’t need to spread the word about our open platforms because Reddit will do something stupid again and there will be another protest and Lemmy will be promoted there”. So I hope we can take this as a lesson that we can’t rely on platforms being shitty in order to switch society over to open standards. We need to do our best to make Lemmy/Mbin/Piefed good as well as known.
The movement to X isn’t universal, it’s more of a “last resort” where a few communities flounder.
Discord is the dominant destination though.