Ootl here. Whats this about defederating?
Generally we can post topics and comments in any instance and can be viewed from any instance. After defederating, the communication between the instances will be cut. so we cannot comment/post with the instance that was defederated.
Pretty sure they meant why is this a fresh topic with OP acting like it’s happening all over the place. I’m similarly OOTL as I haven’t seen any big surge in defed announcements recently. Though I could understand if that was happening in response to the CSAM issues.