sometimes i go to the suite at random intervals and swipe the card open the door then lock up and leave for another while, hoping it screws up any attempt to make a pattern.
i dont think the point is tracking your patterns [that is an issue of itself tho] i think the more proximate issue is that a criminal may photograph record or live stream our intimate moments that occur when there is a full expectation of privacy.
They are very hard to spot. you have to inspect the area of concern for tack holes or raised features in the wallpaper.
As far as price is concerned, there is a fair bit of profit that will be realized short term from the disgusting type of porn that could be generated. Im sure there is some gaurded position regarding sales of these devices, if not there should be.
Depth of field is measured in millimeters for everything they list. I wonder if that's a requirement of the hardware or something that can be overcome.
They are designed for close up work, almost microscope like as you can see in the demo video. I wonder how well they work for a living-room sized scene.
depth of field issues are non existent if you use an aperature disk. if you can afford a fibre optic device you can create the pinhole lens system with aperatures, no glass required.
if you want to go to these lengths then you probably work with or for some alphabet soup federal agency.
https://en.m.wikipedia.org/wiki/Optical_coating