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Recently, the rapid expansion of wireless internet and the spread of smartphones have rapidly shifted the use of the Internet in personal computers and PC web browsers to smartphones and mobile apps. This phenomenon has brought about a major change in the online service market. It has changed the competitive landscape of various online services markets and the business strategy of online service providers.

It also accelerated the innovative and dynamic nature of the online service market. Therefore, it will be difficult to define the applicable relevant market and evaluate the market power and competitive effects of service providers that are in question in the process of enforcing competition law. Under these circumstances, competition law enforcement in the online service market, in particular the application of traditional legal standards applied to the online services market based on PCs and wired Internet, may limit dynamic and innovative competition. In the online service market, it is detrimental to the welfare of consumers.