Zillow's model creates friction by taking a lead generated by one agent's listing and selling it to a competing agent. CoStar's Homes.com exploits this resentment with a simple promise: "Your Listing, Your Lead," ensuring the original agent receives all inquiries directly.

Martin Shkreli posits that Bloomberg's dominance stems from its exclusive messaging system, a critical social feature for Wall Street's relationship-driven culture. Competitors focused solely on data, missing the obvious social component that fosters user lock-in.

The ultimate sign of product stickiness: CoStar's management reports that its primary source of customer loss isn't users switching to rivals. Instead, it's clients going out of business entirely, highlighting the platform's essential, non-discretionary nature for real estate professionals.

The required length of a subscription reveals a company's market power. Bloomberg's two-year lock-in demonstrates immense power, whereas the monthly terms offered by most AI models signal a lack of pricing power and potential commoditization. This simple metric can tell you everything you need to know about their moat.

For Constellation Software's customers, like court systems, switching software isn't just a complex IT project. It involves maintaining a legal chain of custody for records. The high risk of data alteration during migration makes switching practically impossible unless a new solution is 10x better.

Contrary to the belief that Zillow competes with the MLS, its CEO frames the fragmented, cooperative system of 500+ local listing services as a public good. This shared data infrastructure commoditizes listings, forcing Zillow and competitors to innovate on product experience rather than proprietary data.

CoStar acquired Matterport for its 3D "digital twin" technology. This move aims to deepen its competitive moat beyond property data by providing subscribers with immersive, virtual walkthroughs of buildings—a feature that is incredibly difficult and expensive for competitors to replicate at scale.

For many industries, pricing information is difficult to find. A directory that manually collects and displays this data provides immense value to users. This unscalable, manual effort to create price transparency serves as a significant competitive advantage and data moat.

CoStar's defense of its proprietary data is a core business strategy. The company is famously litigious, suing competitors for data scraping and even its own customers for sharing subscriptions. This aggressive legal posture serves as a powerful deterrent and protects its primary asset.