Anything “sovereign” should decouple the protocol from the client software IMO, which isn’t possible with Mattermost.
Well there's always Matterbridge. If you don't have complicated workflows to replicate (and even then) you can just replicate to XMPP, Nextcloud or whatever.
alt Hacker News
Well there's always Matterbridge. If you don't have complicated workflows to replicate (and even then) you can just replicate to XMPP, Nextcloud or whatever.