Dave Ferguson and Jiajun Zhu were working in Google to assist in making an automatic car. When the project folds, they chose to leave with $40 million.
Instead of the self-arriving taxi, they built a business of self driving robotics delivery, which delivered pizzas rather than people. Despite the many risks of failure, it is a massive success, going from two people and $40 million to $5billion and 1000 employees.