Challenges it will face: - insurance regulation, moral dilemmas (decision to make when confronted with living hazards), drinking and riding, more time for adver

Challenges it will face: - insurance regulation, moral dilemmas (decision to make when confronted with living hazards), drinking and riding, more time for advertising, and a rash of start-ups pitches that mash up concepts like Uber & Kozmo because they can. Still seems worth it.