In a weeks-long stretch in 2014, hackers stole thousands of dollars a day in cryptocurrency from owners. In 2017, internet outages cropped up around the United States for hours. Last year, Google Cloud suffered hours of disruptions. Earlier this month, a large swath of European mobile data was rerouted through the state-backed China Telecom. And on Monday, websites and services around the world—including the internet infrastructure firm Cloudflare—experienced hours of outages.

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