I am curious but if a business can sue and win for a "legitimate" bad review, can a customer sue a business for a "fake"/"promotional" good review ?.
Or are business first class citizen and consumers always at the bottom ?
Normally, a lawsuit is brought upon by the injured party to seek redress. I guess if you can produce an argument of how you were wronged, it might work?
Perhaps if you can show that you decided to use vendor X because of fake review Y, and the service you were provided with fell short of what was alleged in fake review Y?
But who will you bring the lawsuit against? Reviewer/Review service/website host/Vendor X/etc. IANAL, but I don't think you can sue the review service or the website host because of section 230.