Somewhat related - my wife and I own a small business and Yelp basically forced us into a $150 a month advertising package by deleting all out positive reviews and posting bogus negative reviews (they were by people not even locate in our state). At the time we were new so this was a big deal.

We went along with it but at some point our card expired and I never updated my account with them. I tracked it for a few months to ensure they weren’t accumulating, once that proved true I never thought about them again and mark their invoices as spam. Going on a year plus and it’s continued to work; we don’t pay them a dime, our few positive reviews we get at yelp remain online and we encourage our customers to avoid them and post everywhere else.