- Creator decides that something (like a task) must send notifications.
- Assignee receives the notification, even if he's not the creator.
In few words, the person to be bothered by the notification has no way to say that he doesn't want to be bothered. At the same time, that same person has no way to say that he *always* wants to get notified. All the power is on the hands of the item creator, at the moment of item creation.