Hidden defamation techniques used on Amazon by someone who sponsor books for a fee, to publicly defame an author, associating offensive and defamatory titles to his works in order to create mental associations in the public such as to discredit him.
Take a look at this image:
![Hidden defamation techniques](https://www.atlantisfound.it/wp-content/uploads/2021/08/Amazon-defamation-techniques-300x169.png)