Built-in device capabilities that Apple provides for free, such as the flashlight or basic camera access, can't be repackaged as a paid feature within your app — monetization has to be for something you've actually built, not a paywall on the OS itself.
A recurring pattern with "utility" apps that lock a trivial OS-level feature, like toggling the flashlight, behind a subscription.
"Your app charges users to access a feature that is otherwise freely available on the device, per guideline 4.10."