Hooks have four basic parts: a trigger, action, reward and investment. User habits are valuable precisely because they do such a good job of keeping competitors out, making it exceptionally difficult for a new company to shake users from their existing routines.
… how to change customer habits, we first need to understand what habits are and how they take hold. Simply put, habits are behaviors done with little or no conscious thought. Research shows almost half of what we do, day in and day out, is driven by these impulsive behaviors.