[gridlockd]

They can't be prevented reliably even through the App Store process - that's simply impossible.

The point of a private API not security, it's to distinguish between the public interface that is meant to be stable and implementation details that might change.

They might do some rudimentary checks to catch obvious usage of private APIs, but it's not part of the security model and still apps show up on the App Store that use private APIs, all the time.