Well, if not identifying himself as the author, file FTC complaint on him since Amazon is a U.S. site ("failure to disclose a material connection to product being endorsed'" "consumer fraud" and "deceptive trade practices" are reasons). To do so, go to https://www.ftc.gov/complaint or call 1-800-FTC-HELP
Applies on any U.S. site (goodreads, librarything, etc.) having or appearing to have consumer/reader/customer reviews -- he has to identify himself as the author (goodreads will note that for him if he reviews from his goodreads author account).
Even when identified as required by federal law, many sites will also have policies prohibiting authors reviewing their own books where it's possible to remove the rating or review by contacting the site or using their flag/report options.
Many sites will also have policies against hate speech and discrimination -- if his review or the comments on his review go into that territory might be able to get the review removed.
Usually writers want other people to know when they comment on books. Bad writers behaviour differently and more or less act like snowflake. Thanks for the tip.
Applies on any U.S. site (goodreads, librarything, etc.) having or appearing to have consumer/reader/customer reviews -- he has to identify himself as the author (goodreads will note that for him if he reviews from his goodreads author account).
Even when identified as required by federal law, many sites will also have policies prohibiting authors reviewing their own books where it's possible to remove the rating or review by contacting the site or using their flag/report options.
Many sites will also have policies against hate speech and discrimination -- if his review or the comments on his review go into that territory might be able to get the review removed.