I do not have any such flag on my iPhone 12 Pro iOS 17.2.1.
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Feature flags are generally used by developers for testing and controlling certain features within an application or system. However, it's unusual for them to persistently turn back on unless there's an issue with the device or some specific application.
Sometimes, third-party apps can cause unexpected behavior. Try identifying if a particular app might be causing the feature flags to turn on. Uninstalling or updating that app could help.