Yet another possibility that I think has a place in this nuance conversation is adapting existing code with changes. It's interesting that we don't culturally today have an accepted way of doing copying + adaptation, but over most of the history of computing it has been very common. It has the obvious downsides of not easily getting improvements and bug fixes of later versions of the upstream code, and rightly is passed over in most cases, but in some cases it's still a win.
Yet another possibility that I think has a place in this nuance conversation is adapting existing code with changes. It's interesting that we don't culturally today have an accepted way of doing copying + adaptation, but over most of the history of computing it has been very common. It has the obvious downsides of not easily getting improvements and bug fixes of later versions of the upstream code, and rightly is passed over in most cases, but in some cases it's still a win.