Kalanick stepped down from Uber after a particularly turbulent period and due to pressure from the ride-hailing firm's shareholders. It was just one scandal after the next for the company in 2017: a New York Times report exposed the company's greyballing tool used to prevent regulators from catching rides in locations where Uber has no permission to operate.

There was also another Uber tool called "Hell" that would send more passengers to drivers who also drive for Lyft in an effort to convince them to work exclusively for Uber. The company's rampant misogynistic and toxic culture also came to light after a former engineer detailed all the harassment she suffered while she was with Uber in a blog post. Her revelation led to a probe that culminated in 20 sexual harassment-related terminations.

It'll be interesting to see what kind of culture Kalanick's 10100 would develop. At Uber, he was known for encouraging an "always be hustlin'" mentality and even praised the Hell program for embodying Uber's "hustle" culture.