Comment by themoonisachees

i've found a genuinely useful application of this that isn't just "talk secretively": I'm part of a community that has a chatroom on both discord and another platform. we have developped a bot that can make the bridge between the two, but it needs to maintain a table in a database of all the bridged messages, so that people use the "reply" feature on either platform, the reply is also performed on the other platform. With this, each platform's bridged message can contain hidden data that points to the other's platform ID, without the need to store it ourselves, and without it being visible to users.

obviously we won't be tearing down the infra already in place anytime soon, so we won't actually be doing that, but that's definitely a useful application for when you don't want to be hosting a database and just wish you could attach additional data to a restrictive format.