A generative AIs only purpose is to generate “works”. So it’s only purpose in consuming “work” is to use them as reference. It exists to produce derivative works. Therefore the person feading the original work into the machine is the one making the choice on how that work will be used.

A human can consume a “work” for no other reason but to admire it, be entertained by it, be educated by it, to evoke an emotion and finally to produce another work based on it. Here the consumer of the work is the one deciding how it will be used. They are the ones responsible.