We already have this on tribe. Click on your profile image from top right to open the menu then follow Account Settings> Email & Notifications. Here the last option is "Notification from groups I have joined" and you can select never from the dropdown menu, so that you won't receive any notifications from groups you have joined.
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Apps & Integrations
The original members of your private group would be retained as long as they are not leaving the group.
Hi Jason. Yes, we have it on our plans for V.2. On our upcoming version, you are able to have some "pages/groups" and then inside each page, you can decide which apps should be enabled. Therefore, you can have the "Reputation" app to be installed on one page/group, but not on the other one.