Speaking ONLY for myself. I do not care one bit if Rybka copied something/anything from another engine....it was better than the one it was accused of copying. Then along came Houdini, better engine...once again everyone starts about copying etc
Must admit have not read the same thing about Komodo. As for Stockfish
there are so many different copies of this engine its unreal.
But my point is that I do not care if someone copies something and then makes improvements, to my mind that's what progress is all about.