Would we say that nasdaq or the NYSE cause trading to suck? Because listing services are just the real estate equivalent: a market. I don’t think the public fully appreciates how these services came about to reduce information asymmetry in North American real estate - many countries don’t even have listing services. We pay for their existence as realtors, you the public benefit in information that once upon a time only existed in the private files of realtors. I can’t begin to imagine why you think Zillow is being held back by listing services or why you would hold Redfin up as some kind of model.