That would actually make the problem with scam apps even worse. Getting software on iOS is super easy and safe compared to Windows where you can install any pro

That would actually make the problem with scam apps even worse. Getting software on iOS is super easy and safe compared to Windows where you can install any program you like. The amount of scams, malware, etc that regular people get tricked into installing in Windows is immense. An open ecosystem does have advantages, but reducing scam apps and malware is not one of them.