Apart from all the obvious externalities of cab driving operations, the extremely high probability of fraud, and the fact that policing cabs is extraordinarily expensive, there's another problem a lot of these analyses miss about why cabs are regulated the way they are. In many large cities, the taxi system is a fundamental component of the transport infrastructure. There are locations in most cities that are not eff…
Startups, VC's and angels don't want to consider any points like that. They only care about how they can get a part of the pie (like any business.) VC and angels are business people who are motivate by profit (full disclosure: so am I). Startups are started by people who simply think everything from the old way of doing things is bad and needs to be overturned and not to trust anyone over 30 as the old saying went.
Along these lines I'm waiting for startups to try and "disrupt" the liquor control system (and liquor licenses) that are in place in various communities across the country for good reason even though legacy owners profit from that "restriction of supply" as well.