It's the "silently" part that's the issue. I acknowledge that lemmy.cafe is entitled to defederate from whatever servers the administration pleases, but lemmy.ml still houses some of the largest communities in the Lemmyverse on some topics, and a heads-up that it was being blocked would have been appreciated.
They are a bunch of toxic edge-lord children. Check the mod logs to see how childish and shitty their mods are when they ban people they disagree with.