I disagree here taking a track from a commercial product and releasing it for another is plain and simple theft. Seeing the bitching that arrises when a track released for free as an addon is converted to another sim without asking it's hardly suprising.
That being said some of it gets stupid like the person who wasn't allowed to release addon textures despite the original author not having any intentions to do any himself or the bitching that occurs everytime someone does something slightly wrong with a skin.