Why focus so much on automatic detection? Just do the simple way that Car2Go does: When somebody gets in, they give a "thumbs up" or "thumbs down" in regards t

Why focus so much on automatic detection? Just do the simple way that Car2Go does: When somebody gets in, they give a "thumbs up" or "thumbs down" in regards to the car's internal cleanliness. If the car gets too many "thumbs down" ratings, then it gets put on the list to be cleaned.