For people which don't beliv it, just visit Amazone and see how many "fake" YYY products are sold which do not only have the same functionality (might be legal) but also have the exact same design, copied from designs of companies where you can be pretty sure they do create design patents for all kinds of things.
Worse this look alike fakes are often placed above the original products when you search for the product even when you include the brand name, I mean surely they are cheaper both in price and quality.
Don't get me wrong, I have nothing against cloning the functionality of an product, I just don't like look-alike clones which can be easily mistaken for the original by people not aware of Amazons problems (I have seen it happen a view times with people in my family.)