China's Mobike founders turned a crazy idea into a $3b startup in 3 years

China's Mobike founders turned a crazy idea into a $3b startup in 3 years

A customer rides a BeijingMobikeTechnology Co. bicycle from a designated parking space outside a subway station in Shanghai, China, on Thursday, Sept. 12, 2017. Across Chinese cities, sidewalks are filling up with bicycles,costing a few U.S. cents an hour, that anyone with an app can unlock with a swipe of their phone. Photographer: Qilai Shen/Bloomberg

It seemed like a nutty idea at the time — and it still does.

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