It’s not interesting or complicated in any way: because a non-human has no free will and is operated by a human, the human (or in this case OpenAI/Microsoft/etc.) is ultimately infringing.
If and when the non-human is granted human rights, this can be revisited.
Yes but do you pass it off as your own original artwork that you created all by yourself, or do you present the book cover in a way that makes it obvious that you are taking a photo of somebody else's book?
No, its the part where you misrepresent somebody else's creation as your own. if its not alright for a person to do then its not alright to automate it. stop trying to play dumb semantic games, its not nearly as clever as you think it is.
It would be on them if the AI generator was forthcoming about how it "created" the image. If a company like MS is advertising that they have a program that creates new content, but that program actually has a known tendency to output content from it's training set then they bear responsibility, especially if that program is being run remotely on their servers.
If a human cannot publicly use a copyrighted image without a license, why / how a non-human can?
If some image are free to use with attribution, how can an ML model track and provide such attribution?