it does. and with a community server (which can still be made invite-only), you can even make "forum" channels.
GitHub gists or GitLab snippets may fit your use case better. or Rentry if it isn't code.if you selfhost, ByteStash or Opengist.
fwiw, system76 support is actually pretty responsive, if you want to try them. they even have their own mattermost server for quicker responses.
this is the founder, so no.