It's especially for these kinds of dumb cases where they simply copy content wholesale and boast about it. With more people licencing their contents as non commercial, the "hot water" these companies get in could not just be trivial but actually legal.
Would be great if web and mobile clients supported signatures or a "licence" field from which signatures were generated. Even better would be if people smarter than me added a feature to poison AI training data. This could also be done by a signature or some other method.