Having an app on someone's phone is a huge attention and data opportunity. You get permissions to whatever you ask for. The unsavvy user will click yes. You g

Having an app on someone's phone is a huge attention and data opportunity. You get permissions to whatever you ask for. The unsavvy user will click yes. You get a push notification channel that can interrupt the user ANY time of day or night and get their immediate attention. Suggesting products and "deals". Use your imagination. Think like an asshole.