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So, what is a double-sided marketplace (or, a two-sided marketplace)? We use these marketplaces every day but most people have never heard this term. A double-sided marketplace is essentially a marketplace that brings together two categories of users who need each other to be successful. One of the most familiar examples is Uber®. Uber requires both drivers and passengers; otherwise it would not be a business. Other examples include matchmaking businesses such as Match®, business review platforms such as Yelp®, and sites like eBay® that bring together buyers and sellers.

These double-sided marketplaces are especially prevalent in the mobile app world but these marketplaces have an unusual legal risk associated with them. This risk revolves around the lack of control over the users.