Reply To: How to unsubscribe banned users to forums and new topics
Not sure about forum subscriptions or if this would work with group forums, but it might be worth a try.
Install this plugin, put the widget into your sidebar, and go to each topic and remove the users subscriptions manually.
https://github.com/easydigitaldownloads/bbPress-Topic-Subscribers
Other than this plugin for topic subscritptions, I do not know what else to recommend right now.
If group admin ban a user, Ideally banned user should be automatically unsubscribed to group forum. But according to my tests new notifications are still sent by bbpress plugin to banned or removed users.
Will keep a note of this, because this is expected if you ban a user. Maybe bbPress or BuddyPress could add this in the future.
