Actually I had that happen to me in Dubai last year. They wanted me to order through the website, I put my order in and then a card payment form came up. I didn't have any internationally-accepted cards back then so I had to order through the server to be able to pay cash. Oh and on top of that they didn't have any real drinks, only bottled soft drinks at 3x the grocery store prices.

I imagine most of the business in such places comes from delivery so they don't care much about dine-in guests.