We introduced our Consumer Alerts program back in 2012 to warn people when we see brazen attempts to manipulate ratings and reviews - either by purchasing/incentivizing people for reviews, writing a bunch of reviews from the same IP address (a helpful indicator that they may lack authenticity), or threatening reviewers with legal action. While our recommendation software does a great job weeding out unreliable reviews so you don't have to, our investigation team is also always on the job.
It’s important to keep in mind that we don’t act in haste when issuing these alerts. Our team painstakingly gathers evidence and conducts stings. And if the offending behavior stops, the Consumer Alert warning will generally be removed from the business page after 90 days.