Uber's valuation is approaching the level of General Motors and Ford combined, but still has a long way to go to catch Amazon CEO Jeff Bezos' net worth.
When the person indicates their UberPool trip sucked because they didn't like the route or their co-rider, Uber won't count the rating towards a driver's average.
Automakers have been scrambling to partner with tech firms to head off competition from self-driving cars and car sharing services that threaten to eventually trim demand for car ownership.
Car makers have rushed to invest in so-called mobility services, hoping to capture the potential trillions of dollars in revenue from selling both vehicles and such on-demand services.
Unlike U.S.-based ride hailing startup Uber, which established itself to compete against taxi companies, the new company will operate using taxi firms.