The writer doesn't seem to mind though.
I mean, my phone and watch can silently record you, too. As can Google Glass, the dozens of CCTV cameras you encounter daily, and Steve Mann's face. It will hardly be any more time before consumers are able to see through walls.
Privacy is a significant concern for many. Not just individuals, but organizations work to ensure privacy is respected, and more (e.g. through policy). Active research occurs, and technology is developed specifically to create privacy-respecting systems and augment the ones that don't already do so.