"Just read that a flagship non-Mastodon instance blocked at least one major server (the biggest UK #Mastodon instance)"
The background here is that this OP did not read (or chose to ignore) the defederating admin's post where he *clearly* said they had engaged in an extended convo with "the biggest UK #Mastodon instance" and had received no satisfactory answer or action
But why let accuracy stand in the way of going off endlessly from your own soapbox, eh?