If you have a bad experience with a realtor, Zillow aggressively censors and prevents your review from showing up on their site. They do this in an effort to lure realtors to join their "premier agent" program.
Simply a negative review that follows their guidelines and is on topic with no cursing or attacks in it will be withdrawn. They will email you from a no-reply address, go figure, saying that the review doesn't meet the guidelines then "explain" how it doesn't "follow the rules" with an irrelevant reason that does not apply to what you have written. They will do this over and over after you change your review as a way to claim you can actually post reviews but deter you from doing so and ultimately stop anything negative from being said about their potential customers for the premier agent referral list. This is the same thing as what Avvo does.
If they fight off negative reviews, then realtors, especially the really *** ones, will be more willing to pay them for membership.
What Zillow does is deceptive and a scheme. They are based in Seattle so file a complaint with the Washington State Attorney General's Office at https://fortress.wa.gov/atg/formhandler/ago/ComplaintForm.aspx and the FTC at https://www.consumer.ftc.gov/media/video-0054-how-file-complaint.
Product or Service Mentioned: Zillow Real Estate Review Listing.
Reason of review: Not as described/ advertised.
Zillow Cons: Cant post negative reviews of realtors, Protects realtors, Censors all negative reviews.