Why do you conclude that? It was a human that wrote the prompt that generated the particular image, and a human that selected the image out of several candidate

Why do you conclude that? It was a human that wrote the prompt that generated the particular image, and a human that selected the image out of several candidates, and iteratively adjusted the prompt to get a desired output, as well as selected the particular model/tool to use. Why would the output of this process not be copyrightable? And what makes it materially different from setting up a plugin in an audio software, input a few MIDI notes and set a few synth parameters. I am pretty sure the audio output from that process is copyrightable/copyrighted?