It would’ve been a much better idea to work things out otherwise.
Here’s the result, so far, of suing the reviewer:
They started with one bad review. Now they have an entire boatload of them.
One bad review may be mitigated by getting good reviews from other customers.
10 or 20 bad reviews: Not so easy.
Are the 10 to 20 bad reviews from actual customers or phantom customers posted by Yelp employees?