I do think this is relevant to the conversation.

I don’t copy/paste code from SO but there is sometimes inevitable duplication because sometimes there is only one right way to do something! Copyright can stray into the case of the ridiculous pretty quickly.

Is an interface declaration inherently different from, say, a merge sort implementation? It’s all code. But they also serve very different purposes. I do not think prior to Google v Oracle there was much case law to distinguish between different types of code, but in the industry we recognize all kinds of nuance.