Why YSK: Beehaw defederated from Lemmy.World and Sh.itjust.works effectively shadowbanning anyone from those instances. You will not be able to interact with their users or posts.
Edit: A lot of people are asking why Beehaw did this. I want to keep this post informational and not color it with my personal opinion. I am adding a link to the Beehaw announcement if you are interested in reading it, you can form your own views. https://beehaw.org/post/567170
They have defederated as a moderation step, not as a technical step. Large instances with open registrations were the source of several trolls that would spew hate, get banned and then simply re-register.
There is no moderation tool to deal with that aside from limiting sign-ups, which the instances in question were unwilling to do (which I get, because manual approval creates a huge workload).
In order to keep their community as safe as possible, Beehaw defederated, because they prioritise community safety over community reach.