Which transportation-related e-commerce innovation was first to reach a $50 billion valuation primarily by connecting independent drivers with passengers through a digital marketplace?

In recent years, transportation companies have increasingly leveraged e-commerce platforms to revolutionize their service delivery. One particular innovation has dramatically changed how passengers connect with transportation services, transforming urban mobility worldwide. This trivia question focuses on a pivotal product development that bridged the gap between traditional transportation and digital marketplaces, creating an entirely new category of service.

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Uber's ride-hailing platform
Lyft's carpooling service
BlaBlaCar's long-distance ridesharing
Didi Chuxing's taxi-hailing app