If a user is subscribed to an Analyze dashboard, there's no way for admins or that user to easily find all of those subscriptions and remove them, leading to a barrage of unwanted midnight emails. The only person who can change subscriptions is the owner of the dashboard - not even others who can edit the dashboard.
Use case - "Robert" was a manager of a department, so we subscribe his to an Analyze report for that department. Robert moved to a different role, and shouldn't get that report anymore. Either Robert should be able to unsubscribe OR anyone with edit permissions on the dashboard should be able to perform the unsub.