I never used Uber sober except to get back to my car after using it the night before. Outside of those travelling for business or pleasure most of their business is people choosing an Uber charge over a DUI. I imagine some drivers will choose to pass on drunk passengers (although if your picking someone up at a bar it's a safe assumption they will have drank a bit). Seems like the bigger thing is to gather data to sell for marketing or development. I wonder what that info will be used for?