I believe that’s what “defederation” is. It’s when a server decides to no longer import or share content with another instance.
No, defederation isn’t shadowed. If an instance defederates from you, you stop receiving content from them, and it’s pretty obvious to anyone paying attention that you’ve been defederated.
Plus, on Lemmy at least, block lists are publicly viewable.
That’s not how I understood defederation. If an instance defederates from you, that instance stops seeing stuff from your instance. But not necessarily the other way around, as defederation is a one-way action.
So if the Cow instance defederates from the Poopie instance, people from the Poopie instance can still see content and comments from Cow users. But Cow users cannot see content or comments from Poopie users. For the scenario you’re describing to take place, the Poopie instance would also need to defederate from the Cow instance.
That said, it’s still not quite shadowbanning. The admins of the defederated Poopie instance would be aware that Cows were not seeing their content. It would depend on the admins to inform the Poopie users that they’ve been defederated. If the users were not aware of the defederation, then it’d effectively be a shadowban.
If an instance defederates from you, that instance stops seeing stuff from your instance. But not necessarily the other way around, as defederation is a one-way action.
I invite you to check out, say, technology@beehive.org from lemmy.world, and from beehaw.org directly. You’ll notice that .world isn’t receiving updates from beehaw. A couple of posts seem to have filtered through somehow, but there are almost no posts or comments coming from beehaw.
The group is completely out of sync with its origin. And it’s not because .world has blocked beehaw. Beehaw very much still appears under .world’s list of linked websites.
Blocked instances are blocked, and when you block communication between sites, that’s usually a two-way street.
