I dont believe that users got scammed due to downloading fake app directly from App Store. All apps passes tons of moderation before getting into App Store. Despite Google Play Store, which is full of fake and scam apps.
This is not about what you and I believe concerning the situation happening in the Apple and Google play store but it something that has been proving by a lot of people. However, it will be a wrong decision to put your security in the lite/no genuine moderation done by the Appstore and Google play store because hackers and online theft are coming up with new scams ideas.