I do appreciate your point because it's one of the interesting side effects of AI to me. Revealing just how much we humans are a stack of inductive reasoning and not-actually-free-willed rehash of all that came before.

Of course, humans are also "trained" on their lived sensory experiences. Most people learn more about ballistics by playing catch than reading a textbook.

When it comes to copyright I don't think the point changes much. See the sibling comments which discuss constructive infringement and liability. Also, it's normal for us to have different rules for humans vs machines / corporations. And scale matters -- a single human just isn't capable of doing what the LLM can. Playing a record for your friends at home isn't a "performance", but playing it to a concert hall audience of thousands is.