Greyball is a software tool used by the ride-hailing service Uber to identify and deny service to certain riders, including riders who Uber suspects of violating its terms of service. Uber's use of Greyball was made public in a March 3, 2017, investigative report by The New York Times, which described how, as early as 2014, Uber had used Greyball to evade local government authorities in the United States, Australia, South Korea, and China. In the days following the publication of the New York Times story, Uber admitted that it had used Greyball to thwart government regulators, and it promised to stop using the tool for that purpose.
Uber reportedly developed Greyball to identify individuals who Uber suspected of using its service improperly, and it began using the tool as early as 2014. According to Uber, Greyball can "hide the standard city app view for individual riders, enabling Uber to show that same rider a different version." Uber claimed that it used Greyball to deny service to individuals suspected of violating the company's terms of services, such as people seeking to harm Uber drivers, disrupt Uber operations, or carry out law enforcement actions against Uber drivers. However, after The New York Times revealed Greyball's existence in March 2017, Uber said it would stop using it to evade local government regulators.
According to the New York Times report, which was based on interviews of four current and former Uber employees and a review of internal Uber documents, Greyball used several methods to identify and deny service to government officials who were investigating Uber for violations of local laws. Those methods included:
In May 2017, several news organizations reported that the United States Department of Justice had opened a criminal investigation into Uber's use of Greyball to avoid local law enforcement operations. The Department of Justice initially focused on Portland, but the inquiry was expanded to include Philadelphia.
On March 6, 2017, the City of Portland, Oregon announced an investigation into whether Uber had used Greyball to obstruct the enforcement of city regulations. The investigation by the Portland Bureau of Transportation (PBOT) found that:
When Uber illegally entered the Portland market in December 2014, the company tagged 17 individual rider accounts, 16 of which have been identified as government officials using its Greyball software tool. Uber used Greyball software to intentionally evade PBOT’s officers from December 5 to December 19, 2014 and deny 29 separate ride requests by PBOT enforcement officers [...] In using Greyball, Uber has sullied its own reputation and cast a cloud over the [Transportation Network Companies] industry generally.— Transportation Network Companies: Regulation Evasion Audit, Portland Bureau of Transportation, Report Summary, April 28, 2017
Following the release of the audit, Portland's commissioner of police suggested that the city subpoena Uber in order to force the company to turn over information on how Uber used software to evade regulatory officials.
This section needs to be updated.(January 2018)
Transport for London cited use of Greyball in London as one of the reasons for its decision not to renew Uber's private hire operator licence. The decision states that the way in which Uber uses Greyball contributes to it failing to meet the standards of a "fit and proper" private hire operator. Consequently, Uber would not be able to operate legally in London after its licence expired on 30 September 2017 unless they entered an appeal within 21 days. Uber stated they would be challenging the ban in court "immediately".
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