This covers apps whose primary purpose is to encourage recreational drug use or make consumption of illegal substances, alcohol, or tobacco seem appealing or harmless — informational or harm-reduction content is treated differently than promotional content.
Cannabis- or party-culture apps that read as promoting use, rather than informing about legal status or safety, are the most common trigger.
"Your app encourages consumption of illegal substances in a way that could appeal to minors, which is not permitted per guideline 1.4.3."