Trulia

Trulia raised $33M to compete with Zillow in real estate search, reaching 23 million monthly users before being acquired by Zillow in 2015 for $2.5B—ending the competition by consolidation. The duopoly of Zillow and Trulia proved unsustainable for both; winner-take-all dynamics required one victor. Like organisms competing for the same niche, one absorbed the other.