The argument is that's legally and morally wrong, as both cases are stealing from the person who holds the rights to the song. It's the same as someone using something of yours without your permission, as long as they don't make a profit off it. Movies and tv shows buy licensing rights to songs all the time, and the artists makes money off of it. If I bought the rights to a song, and sold the rights to a movie does that make me wrong? Not really, it just means I made a business investment that's paying off.