Given that the protocol is E2EE, how do they handle data retention / transparency requests? Does each agency centrally store copies of their employees' encryption keys?
Funny you ask this, I remember actually having a discussion about doing this, but for another reason - to avoid users losing their messages because they lost their keys. We ended up not doing it of course, it makes no sense to have e2ee if you're going to bypass it anyway... If you need to be able to access the data I think you should probably force your users to not use e2ee rooms...
Honestly, chat is the equivalent of a person to person regular mouth to ear communication. Some stuff needs to be off record. Which effectively means, nothing in chat and not on a formal document is just coordination. Like it was for centuries.