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Re:LibreTaxi – A free and open source alternative to Uber an... by ValentineC on Tuesday January 31, 2017 @09:43AM (#13530889)
I think it's more because Grab (Uber's competitor in Singapore) has always had the cash option from the start (Grab introduced GrabPay — their credit card option — after) [1], and Uber was trying to match the "feature".

[1] https://vulcanpost.com/171862/grabtaxi-uber-challenge-cashle...

Re:LibreTaxi – A free and open source alternative to Uber an... by pajop on Tuesday January 31, 2017 @11:08PM (#13538155)
In the Philippines, Uber accepts cash. It has the options UberX, Uber Black, UberPool and UberHop (point-to-point)