[bandrami]

What keeps people from doing that on subways now? Nothing but the social contract, and so subways are generally somewhat dirtier than cabs, but still get you from point A to point B.

[JonnieCache]

There are lots of other people on the subway who can alert staff that cleaning needs doing.

[autotune]

The difference is you have much more privacy in an Uber vehicle. Someone about to make a mess in the subway might be more inclined to wait until they get off vs a private vehicle with just them in there.

[jonknee]

How do you have more privacy in an Uber vehicle that knows your identity, everything about your trip and can bill you for any damage? You're anonymous on most transit.

[joosters]

Privacy? Everything you say & do in the cars will be recorded, and Uber isn't the kind of company that would treat that data well.

[autotune]

The illusion of privacy. Barrier to entry for using Uber is not exactly high and when you're intoxicated you may forget or simply not care.