Core Viewpoint - Zillow and Redfin are facing lawsuits from state and federal officials for allegedly engaging in anti-competitive practices in the online rental advertising market, which could lead to higher costs for consumers and fewer rental options [1][2][3]. Group 1: Legal Allegations - Attorneys general from five states, along with the Federal Trade Commission (FTC), have filed lawsuits claiming that Zillow and Redfin violated federal antitrust laws, specifically the Sherman Antitrust Act and the Clayton Act [3]. - The lawsuits allege that Zillow paid Redfin $100 million to shut down its online rental advertising business and transfer its clients to Zillow, which included the firing and rehiring of hundreds of employees [4][5]. Group 2: Market Implications - If the allegations are proven true, the collaboration between Zillow and Redfin could lead to increased advertising costs for rental properties, which may be passed on to consumers [6]. - The potential rise in advertising costs could limit options for consumers, particularly affecting smaller landlords who may struggle to afford advertising on major platforms like Zillow [6].