They're not lying, they believe it's happening. That doesn't mean it is, however. Chances are they're seeing things that can be explained in other ways. People

They're not lying, they believe it's happening. That doesn't mean it is, however. Chances are they're seeing things that can be explained in other ways. People who say they've seen bigfoot aren't lying when they genuinely believe they've seen bigfoot. That doesn't mean bigfoot exists. If Yelp actually did shake people down like that, there would very likely be concrete proof by now (recorded phone calls, documents, emails, undercover journalism, whistleblower employees). Just as there would be concrete proof of bigfoot by now.