The news: South Korean super app Kakao’s nationwide outage disrupted communication, prevented mobile payments from going through, and stranded passengers trying to use ride-sharing services, per The New York Times.

The dangers of app consolidation: Kakao’s outage affected the  more than 90% of smartphones in the country that have installed the super app.

• The 11-hour outage was reportedly caused by a data center fire near Seoul that downed 32,000 servers—30% of the company’s total servers.
• The outage locked tens of millions of users out of messaging, payments, online shopping, maps, games, and ride-hailing services.
• Kakao, which started as a messaging platform KakaoTalk, has more than 47.5 million users in South Korea, per Forbes.
• "We did not prepare for a complete shutdown of an entire data center," said Kakao's co-CEO Hong Euntaek, adding that previous emergency drills had mostly involved contingencies for traffic surges.
• Euntaek said Kakao “will increase infrastructure investment so we can be prepared for [the] shutdown of a data center or two.”
• While the majority of Kakao’s systems were restored by Wednesday, miscellaneous functions like payments for taxi and restaurant bookings remain unavailable for some.

Fallout from the outage: The ensuing government and public outrage resulted in the resignation of Kakao’s co-CEO When Nam-koong.

• South Korean president Yoon Suk-yeol ratched up scrutiny over the company’s monopoly on services and its apparent lack of contingencies.
• Multiple customer groups are preparing a class-action suit against Kakao, per KBS World,  including small-business owners who advertise through Kakao’s channels and claim to have suffered significant losses.
• “Trying to resolve the problem with antitrust regulations doesn’t look effective because KakaoTalk is free and people voluntarily use the app,” Wi Jong-hyun, a business professor at Chung-Ang University in Seoul told the Financial Times.

A cautionary tale: Kakao’s post-outage tribulations underscore the dangers of loading myriad services into a monolithic super app—something to keep an eye on for aspiring super apps.

• Uber has consolidated its ride-sharing, food delivery, and booking services into a unified app experience.
• Twitter is the process of being acquired by Tesla CEO Elon Musk, ostensibly to be expanded into a super app.
• Sixty-seven percent of US adults want a super app to manage their digital activities, per PYMNTs.com. Many are likely attracted to the convenience of dealing with fewer service providers.

The bigger picture: When super apps go down, a multiplier effect takes down all the included services. 

• Diversifying data centers and enabling app services to work more independently could reduce the effects of widespread outages—or at least speed up recovery.

This article originally appeared in Insider Intelligence's Connectivity & Tech Briefing—a daily recap of top stories reshaping the technology industry. Subscribe to have more hard-hitting takeaways delivered to your inbox daily.

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