It’s not turning copyright law on its head, in fact asserting that copyright needs to be expanded to cover training a data set IS turning it on its head. This is not a reproduction of the original work, its learning about that work and and making a transformative use from it. An generative work using a trained dataset isn’t copying the original, its learning about the relationships that original has to the other pieces in the data set.
It’s not turning copyright law on its head, in fact asserting that copyright needs to be expanded to cover training a data set IS turning it on its head. This is not a reproduction of the original work, its learning about that work and and making a transformative use from it. An generative work using a trained dataset isn’t copying the original, its learning about the relationships that original has to the other pieces in the data set.