What happens is that a company or individual will pay for hundreds of positive reviews of their product, so that when a potential buyer sees the reviews, all they see are positive reviews and 5-star ratings. In the case of Goodreads, the product is books. These reviews can be written by a bot or a person with multiple fake accounts.
Positive reviews aren’t the only scam being pulled on Goodreads either. Scammers will write hundreds of negative reviews of a book, claiming the book contains incorrect, inflammatory information. Then, using a different profile, the scammer will contact the author of the book and offer to “fix” the bad reviews for a steep fee. After all, better reviews equals better sales, right?