Managing Concurrent Subscriptions for Users with Shared Email Addresses

In this scenario, users have subscribed to a service using the same Gmail or Apple email on their mobile devices but have logged in with different email addresses and passwords on each device. The objective is to restrict access to the subscription service to only one user at any given time, while preventing others from using the same Gmail or Apple email on multiple devices. To address this, implementing robust user authentication mechanisms, allowing only one active session per user, implementing session timeouts, providing user notifications, offering account management options, and communicating a clear subscription policy are key strategies to ensure that only one user can utilize the subscription at any given time.