The very fact of existence of such Spyware Engine has effect that each person would behave as 'someone is looking'.
This means zero privacy. This means 'no privacy' feeling. Everyone is more 'careful' when people around. And this has prolonged effect on society's freedom, democracy and rights of individual because independent thinking happens when true privacy is there.
Even a fear of false triggering the system and exposure of one's private thoughts/pictures/events to other people during 'sorting out false alarm' would make people behave differently. Even if they have nothing to do with any children the fear that their private moments can become public just because some AI would decide so would make each person think twice about each step.
This is a huge attack on privacy of individual and should not be taken lightly. The effect will be also huge. Just imagine what they will do next if they get away with this. Just imagine what other companies will do once this is accepted for apple devices.
I think this can/should also be considered as a fraud because when one bought apple device one was never told that spyware would be installed some day later.
Edit: I think it should be illegal/made illegal to install any spyware on any device for any excuse without warant. Spyware is a Search of 'home' without warrant to some degree, isn't it? Done through the hands of some private company under some excuse... What about Fourth Amendment?