I personally know multiple business owners who've dealt with threats from customers who will go and write a bad review if they don't simply bow to demands. Medical offices are another issue entirely because many medical professional don't even know if they are allowed to respond to complaints due to HIPAA.
I know one who even had a bad review from a phone call from a woman that simply called and yelled at them for not getting free service. It was their first and only review in years. Never even set foot in the building.
People are basically given permission to hang a sign on your front door that you're not allowed to take down.
I'm all for reviews and feedback but at least Amazon shows "Amazon Verified Purchase". Balance it somehow with either cross reference to the BBB or document how many years the business has existed. There are far too many businesses who've been open 10+ years with thousands of customers that have never felt the necessity to leave a review.
Without verification that the person has actually a customer, it's basically just libel.