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Of course it was based on others work, that doesn‘t mean the „other artists“ created it! What would the machine generate if it had nothing to train on?

What if nobody ever taught you to read or write? What if nobody was every taught to paint or draw?

Arent people trained too?

Sure, people are trained, but people are no machines and it mostly is frowned upon when they copy others work. A “trained“ machine does nothing at all on itself, it still is a tool filled with input of us, the people. Btw. using the word „trained“ for feeding a software with data is highly inappropriate imo.