That is not a factor may have something to do with the fact the law was created before even sci-fi authors could have predicted machine learning and the huge di

That is not a factor may have something to do with the fact the law was created before even sci-fi authors could have predicted machine learning and the huge difference it makes for creating artwork. Generating synthetic copies of someone voice, or even combining voices (e.g. a CG voice that is a equal parts Kurt Cobain's voice and Laine Staley's voice) are also not currently a factor in copyright law, but it will be.