Which groundbreaking marketing strategy did Virgin Hyperloop One use in 2017 that dramatically increased its public visibility and investment potential?

The transportation industry has seen remarkable marketing campaigns for revolutionary technologies. One of the most talked-about transportation concepts of the past decade has been the Hyperloop - a proposed high-speed transportation system in sealed tubes. Various companies have competed to develop this technology, each with distinctive marketing approaches to attract investors, public interest, and government support.

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They rebranded from 'Hyperloop Technologies' and brought Richard Branson on as chairman, leveraging his celebrity status and Virgin brand recognition
They launched the first underwater Hyperloop test track, generating viral video content that reached over 100 million views
They created a gamified mobile app allowing users to design theoretical Hyperloop routes, with the most popular becoming official proposals
They partnered with SpaceX to announce the first commercial Hyperloop passenger service between Los Angeles and San Francisco