Comment by Rmilb

Uber uses Braintree for payment processing[1]. Braintree already has integration with Coinbase[2]. I assume that bitcoin transfers being push (instead of pull like credit cards) is the reason they haven't activated it.

1. https://www.braintreepayments.com/case-studies/uber

2. https://www.braintreepayments.com/features/coinbase