Chat is by its nature not supposed to be the hub of an open source project, because it's a real time thing in a distributed group of people who may not be able to do real time.
From this, it sounds like the only substantive difference you're hung up on is message persistence. If that's being provided by a stable third party (i.e. a log bot, the technical details of which are irrelevant), what else are you missing?
From this, it sounds like the only substantive difference you're hung up on is message persistence. If that's being provided by a stable third party (i.e. a log bot, the technical details of which are irrelevant), what else are you missing?