Who cares? If patients want to call the ER, find out I'm on duty (not sure the clerk would actually tell them anyways), look up my reviews online, decide they are not good, and go to a different ER, that's fine by me. I'm making the same hourly wage if that person shows up or not.
These reviews are more important for outpatient physicians treating elective or less time-depending conditions who must compete with each other for patients.
You get get your total knee arthroplasty anytime between now and eternity, if you want to do research on which orthopedist is "the best," you generally can. If you have "10/10 abdominal pain" you generally go to the closest ER. The ER is still gonna have patients packing the waiting room when I show up for my next shift.
Now if your SMD/CMG/group/employer whatever ties your performance and job security to these reviews, then you have reason to care about them; however, this is independent of them being published publicly anyways.
My point is, if you're in a situation where you need to care about reviews, then you need to care about reviews, and "where" they are published is immaterial.