What this guideline means in practice
2.3.1 covers two kinds of dishonesty. The first is toward App Review: new features and product changes have to be described with specificity in the Notes for Review section of App Store Connect and be reachable during review. Apple says generic descriptions will be rejected.
The second is toward users: promoting content or services the app doesn't offer (Apple's example is iOS virus and malware scanners) or promoting a false price, inside or outside the App Store. That can lead to removal from the App Store, a block from alternative distribution, and termination of the developer account.
Hidden or dormant features used to be cited under 2.3.1. Since October 2026, Apple covers them in Guideline 2.5.19, which also names code obfuscation used to hide features.