The level of idiocy in these boards is amazing. Yes, one can argue that $500 is too much to pay for this. But, yes, newer cars have the same functionality but if you actually read the article, you'll note they are targeting older models that do not have rear view cameras, which is mostly cars from 2013 and older. Them's plenty cars out there this could support.
Per the comment about this being illegal in NC, don't worry, law enforcement in NC is more concerned about who's using the bathroom then looking for someone with a license plate frame.
Yes, we read it and even through our sheer idiocy we managed to deduct that $500 is still an absurd price point for this device. There are millions of cars out there this could go on, you are correct. Not for $500. And no one will be buying this.