A user that is member of the subscription's subscriber group can opt in/out of the subscription.
Subscription is contributed and not persisted. This means certain fields of the subscription, like Filter, are read-only.
Subscription's subscriber is a group, not a user
None
For role based subscriptions, there is an expectation that there will always be at least one actor that matches
If the subscriber is a group, is it a team.
Read-only indicators that further describe the subscription.