When you create slack apps, they are private to you. Only you can edit the settings of the app, and only you can install it onto an organisation. Notice the “Not Distributed” status:
You can then install your app onto your Slack organisation. If you have slash commands set up, anyone in that organisation can control the ‘rules’ for any channel they have access to, and so you should make sure to set the
chat integration discourse username appropriately.
‘Collaborators’ of the Slack app means that they can edit the app’s settings (things like callback URLs, auth secrets etc.). It has absolutely nothing to do with who can configure ‘rules’ using slash commands.
/discourse status should list all of the rules for the current channel. So if you have set up rules for #general using the discourse admin interface, they should show up when you run /discourse status in #general. If that’s not working, it’s a bug.