According to the Google Play developer content policy, Google wants to build "the world's most trusted store for apps and games." With this in mind, the company has updated the developer policy with examples of things that will get your app removed from the store, such as sexually explicit material, excessive graphic violence, or use of drugs, plus some 'metadata' app listing items which are now not allowed.
The listing is an important part of how an app is promoted to customers.
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