Due to the protections of the Digital Millennium Copyright Act, American-based websites with strong freedom-of-speech ethos will ignore people who claim that they have been defamed by user-created content unless they have a successful court decree of libel.
How weird then that someone in the US seems to be filing cases of libel against possibly fictional people with the same name as real writers, having these possibly fictional people agree to the court that they have committed defamation, and then the ensuing decision is used to have real reviews on Yelp or Google or wherever removed.