>>1024704 (OP)
>How likely is it that this is an intentional spying feature with plausible deniability as a bug?
Not very. Based on how it works, it wouldn't be especially useful for glowdarks. They also already have access to all of people's Apple data through the PRISM program, and supposedly they can remotely activate the microphone and camera on most smartphones whether it's running Facetime or not.
Sometimes a bug is just a bug.