Even with all that, you're leaking an unacceptable amount of metadata. And what about reliability? If I cause the key to change, and then alter my PDS so it on

Even with all that, you're leaking an unacceptable amount of metadata. And what about reliability? If I cause the key to change, and then alter my PDS so it only shows that event to one half of users, did I completely mess up your protocol so you have to delete the chat room and start over?