This is such a nothing argument. If all you're talking about is a summary of a book, people have been able to get that long before AI. I can go to a wikipedia entry right now of any book and look at a plot summary. The author does not get paid for me looking at the summary on Wikipedia. There are numerous other sites where you can find summaries of books. And if you're asking an AI for a summary of a specific book by a specific author, what attribution would you like to see? The user already knows the source because they're specifically asking for a summary of that source.

A bigger concern would be the AI reproducing your works and using them in responses.

Not going to pretend to be able to read the minds of Hamas. But it seems like the idea was that taking hostages would give them leverage to negotiate. Because although the Israeli government generally regard Palestinians as subhuman barbarians, surely they wouldn't risk the lives of the hostages by retaliating full force. And it seems in general they were partially right. The general population of Israel is calling for a ceasefire because they are concerned for the safety of the hostages and want their friends and family back. But Netanyahu seems to have very little interest in negotiations.