Surely this should be an easy fix for them to be able to detect counterfeit books being created? If they are anything like other on demand self publishing platforms, you upload a pdf or similar file to create the book, and surely it's not beyond the wit of those at amazon to create an ml based system that would be able to detect similar files to those of legitimate books that they already carry and flag them to the legitimate publisher for manual review (if they can't be bothered to police it themselves as it appears)?