I'm not going to endorse copying over package managers on the grounds that copying makes it easy to get away with violating big companies' legal procedures on the use of third-party code.
I wasn't endorsing, just providing an explanation of why while in theory copying and package inclusion are the same from a license standpoint, they likely often aren't in reality. That doesn't mean it's a good thing.
Your argument is the correct moral and legal one. Unfortunately that doesn't always matter. For another example, see the cognitive dissonance many express regarding ad blocking (not to come down entirely on one side of that issue, it's complicated).
