"Guideline 4.2.2 - Design - Minimum Functionality
We noticed that your app only includes links, images, or content aggregated from the Internet with limited or no native iOS functionality. Although this content may be curated from the web specifically for your users, since it does not sufficiently differ from a mobile web browsing experience, it is not appropriate for the App Store.
We encourage you to review your app concept and work towards creating an app that offers customers an engaging and lasting experience that also meets the App Store’s high expectations for quality and functionality.
Apple Developer includes a variety of design and development resources. Download iOS templates from Apple UI Design Resources, learn more about crafting intuitive, well-designed apps with the Design Video collection, and review the iOS Human Interface Guidelines for best practices to follow when designing apps for the App Store.