The document discusses the concept of "FREE attacks" on existing paid business models and services. It defines different types of "FREE" business models including ad-supported, cross-subsidies, gift economies, and labor-exchange models. It provides examples of services like Gmail, Facebook, and Twitter that have used free offerings to disrupt existing paid competitors. The document suggests that "FREE" does not necessarily mean there is no value, as digital services can capture non-monetary value through alternative currencies and means of getting paid.