That's preposterous. People (for the most part) don't just sit around writing fake reviews for companies they have no dealings with. If fake reviews about an organization exist, they were commissioned by the organization or its associates. I guess you could try to get a competitor in trouble by creating obviously fake reviews and hoping said competitor gets taken to court over them; but that seems like a lot of trouble, high risk, and not something worth worrying about.
It will be interesting to see what comes out of this case.