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Further more: what is exactly the purpose of knowing who is blocked by whom?
There’s good reason as a regular Lemmy user. To properly interact with a remote community you need the instance of the community linked on your sign-in instance and you need your sign-in instance linked on the remote instance.
For example if I sign in on lemmy.ml and I want to interact with a community local to beehaw.org, I have to go to beehaw.org/instances and check lemmy.ml is linked. Then I have to go to lemmy.ml/instances and check beehaw.org is linked. It’s kind of an unruly task with the /instances lists as large as they are so a tool to check that for you is very useful.
Okay, let me say not blocked. Yes linking is automatic, but if an instance appears in the linked column, it can’t appear in the blocked column. You want to check that neither instance is blocked, which is the same as saying both instances are linked.