My guess is that star fields are less variable and thus more predictable. Presumably their software has access to a database of what you should see in the night sky given your location and time. So it is fair to enhance those images.
Regardless, most companies do not have the tools to enhance images captured on their video cameras and it is annoying when users come to my office expecting me to be able to do what they do on TV shows.
Just like most crime scene investigators don't drive Hummers (as seen on CSI) and most medical examiners don't have access to holographic projection screens (as seen on Bones).
Imagine what the tax-paying public would say if a state or federal agency had those unnecessary toys!
