For projects, where they have their community presence also speaks to their ideology. Those projects’ communities chose to move off of Reddit, and be on Lemmy; those projects’ communities chose the instance they’re on.
One may plea ignorance in the early days of Lemmy, that they’re misguided by the instance description; but now a year later after all the drama, their decision to remain there will start to influence who will be able to interact with their community.
I have no sympathy for communities that chose to remain on CSAM infested instances that got defederated, and I will have no sympathy for project communities that continues to associate with ideologies by the ml admins.
The communities above are not managed by a project organisation (the only one I know if [email protected]), it's just that until last week, lemmy.ml was considered the go-to instance for FOSS and Linux.
Network effect is here, I know it first hand as I've been busy posting to [email protected] to try to offer people an alternative to the lemmy.ml community.
But I'm not planning to do that with the communities above, and same for the other FOSS communities, because I have other stuff to do
The vast majority of people going to those communities just want a place with enough people to answer their questions on the topic. They are not going to organize a migration, most of them are probably not even aware of the issues with lemmy.ml administration (seems like the post got removed from lemmy.ml: https://lemmy.ml/comment/11606059)
I see where you come from, and I get it to an extend, but the vast majority of people are probably going to keep going to those communities without any change.
If someone wants to organize a migration of those above communities (the thread I linked above can be a starting point), feel free, but I wouldn't count on it. And without an active migration, those communities will stay the reference for those topics.