Has Apple ever cracked down on apps that allow the purchase of physical things for not using in-App purchases? IIRC the only time this has gotten sticky, is wh

Has Apple ever cracked down on apps that allow the purchase of physical things for not using in-App purchases? IIRC the only time this has gotten sticky, is when it comes to apps that allow users to buy access to more content that is accessed by that app. (e.g. buying new issues of digital magazines, buying access to new in-game content, buying new ebooks, buying new digital music, etc)