An Uber representative assured me that the company isn’t doing anything like that at the moment, and isn’t even receiving individual-level data from Barclays. But the company has plenty of incentive to exercise its right to do so in the future. With individual-level transaction data, Uber could, for example, use cardholders’ dining-purchase histories to recommend restaurants on UberEats. Even more valuable would be access to information about cardholders’ use of competing ride-share platforms and other modes of transport. Some people might consider exposure of transaction information to be an invasion of their privacy – but of course nobody’s forcing them to sign up. And we know that lots of consumers are perfectly willing to exchange data for convenience and a little bit of cash; they might not notice where Uber could be heading and might not care if they do.

https://www.bloomberg.com/view/articles/2017-12-06/uber-really-wants-you-to-use-its-credit-card