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Why was the instance blocked on lemmy.ml?
It's pretty awful for an average Lemmy user, because you can get cut off from communities you already subscribed to, without any notification! So you might post and comment without realizing that your content is not getting published, even though you and your local instance still see it.
The user experience would be improved by getting a warning if you try to contribute to a community in this case. And also your subscriptions should show warnings about not working anymore, and those should come up as notifications on the account.