In this case, what is the point of the CC-BY license at all? Additionally, artists who submit their textures to the site only license it under CC-BY [1]. This means that the website's operator may not actually waive the Attribution requirement. I have contacted the website operator to clear this up.

[1] actually, the submission form says "You also agree to let me license the pattern as Creative Commons – in other words, give it away to the world for free. " This is quire ambiguous.