Appstore gives people a false sense of security. They think everything available on apple platform is legitimate and thoroughly tested, but one thing I know about scammers/hackers, they always try to get a way around.

This might have been the link to one of the fake apps, but It appears to have been removed - https://apps.apple.com/vn/app/sparrow-wallet-btc-whirlpool/id6466330147