A one star difference in a hospitality business like restaurant can give or take double digit business. Yelp reviews are very crucial and affect the business a lot. A lot of Yelp reviews have the negative content which is damaging the reputation of the companies. Yelp does take action to yelp review removal that is overtly fake or without substance at the request of business. However they also allow the reviewer to stand behind their reviews. Yelp explicitly say that a negative review might not be removed if the reviewer states that the review he/she has posted is factual.