From Ars Technica:
Doctors and dentists tell patients, “all your review are belong to us”
“An organization called Medical Justice is encouraging doctors and dentists to use copyright law to censor their patients’ online reviews. We found one of their clients in the wild and report on what we learned.”
It’s no surprise copyright can be used for censorship; that’s how it originated. See e.g. Mike Masnick’s post Copyright As Censorship: How Howard Hughes Used Copyright To Try To Block Biography He Didn’t Like.