If the context owner refuses to acknowledge any and all incoming replies, the thread is effectively locked. @julian@fietkau.social That's correct. Context owner distributes approved activities to participants and also maintains a collection containing only approved activities. Replies (or reactions) that have not been approved are considered rejected. A similar mechanism exists in Interaction Policies but it is post-based rather than conversation-based, and with Accept activity instead of Add. Some FEP-171b implementations add canReply flag. I should probably mention it in the FEP but it is basically the color of the bike shed. The actual control mechanism is much more important. @technical-discussion @julian