I was annoyed at the caginess of your answer until I saw you ran a randomness-as-a-service company and these are low grade trade secrets.

If I were going to take a stab at this, I would guess that most of the "camera" is really unnecessary and that you could do this using just the image sensor.

A lot of the camera is just functionality to make actual pictures better that don't apply here. Eg you don't need to control exposure with shutter speed if it's in a black box.

Having a whole camera might even be counterproductive. Eg actuating the shutter is predictable, so it might reduce entropy if actuating the shutter creates a signal that shows up in the randomness.

Or maybe they just mean pro quality cameras, but I'm not sure why you'd want a whole camera instead of just the sensor. Reasons are not readily apparent, and I don't expect anyone to be immediately ready to correct me on trade secrets.