Just because it not a law protecting does not change right from wrong. Just because you could find a way to kill someone without breaking the law does not mean you can morally. The law is only there to enforce right or wrong.

The premium work has a price for a reason and taking it like will simply prevent them form doing more of such work later. You should also know they do not even have to give away their free work. So in reality you should be thankful you got something for free instead whining you did not get more for free.