The thing is that some of the artists here do make money off their art in a variety of ways. Through webgaphics, prints etc. So if they are distributing the images as tubes they are most definitely open to a lawsuit for loss of income. If I make an image specifically for a web design that I sell(and I have done so) and they distribute the image as a tube I lose income because someone can make their own set or linkware more easily with the tube. Equally if I claim (and I do) that the art on the sets are original and someone sees linkware sets with the same artwork it destroys the "original" "limited editions" that I offer. Doesn't matter if they are only re-distributing something they found (The most common excuse) they didn't make it so they are liable.

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo