A recent New York Times article talks about “copycatting” in the fashion industry. (N.B. This kind of copying is not counterfeiting, as only the design is copied and not the label.)
“Rather than harming originators, as piracy is supposed to do, in the fashion context it often helps them.”
So, here we have an example where copying without citation is not only accepted by an industry, it is even considered key to keeping that industry alive. The world is not black and white!