I’d be willing to bet that no one is looking in the top X% of grossing apps for spam/scan. They probably (wrongly) assumed that most people wouldn’t spend money on a scam and most people wouldn’t be fooled, only a small set of people. In fact, I doubt their AI’s training data lacked anything like this.
But isn’t that the primary reason Apple claims to want to maintain the walled garden and build “idiot proof” products - because they realize many people easily get fooled and spend money on scams?