To be very brief:
Beehaw seeks primarily to protect its users and create a space where they aren’t going to be attacked for being who they are.
The Beehaw admins noticed they were dealing with a lot of hate from 2 lemmy instances which had open sign ups.
Beehaw defederated from those 2 instances.
There’s been some kickback from people who think defederating goes against the core values of Lemmy.
That’s all I’ve got, I’m sure others will be able to add to this
Anything by CGPGrey but specifically Humans Need Not Apply