Believe it or not, after 20 years of people buying things on iPhone apps, people will assume it’s safe and easily refundable when things go wrong, only to find out that because they paid for something through a dodgy payment gateway in an app on the App Store their credit card details have been stolen.
This will happen. There are thousands of online stores that insecurely handle credit card details. It might only be 0.5% of people, but it will happen and anyone saying it won’t has clearly not paid attention to the cybersecurity world.