Hypothesis

Some categories never developed a competitive response to this strategy : email, advertising infrastructure, user-generated video.

大多数人认为所有商业领域都有能力应对颠覆性竞争，但作者指出某些类别如电子邮件、广告基础设施等从未找到有效的竞争对策。这暗示了某些市场结构可能存在根本性弱点，无法通过传统竞争策略应对免费化浪潮。