According to https://news.ycombinator.com/threads?id=CyberMacGyver it installed a keylogger in a comment currently above

It won't even have a camera. Could just infer from location, time, and orientation data.

No, its about (de-)bayering. It's before the concept of multi-color 'pixels'.

That used to be the idea but high voltage DC lines are now more efficient than ac