[dnautics]

most limo services (don't know about uber) offer fixed rates (time or distance). Since Taxis pick you up and start running a taximeter to charge you, that's something that needs to be regulated to make sure that they don't stiff you. If a limo service shows you the route and gives you a quote on the cost, then there would be no need for that level of regulation as well.

There are some regulations that should be there in common, such as protections for the passenger (since you're effectively imprisoned) but stuff like background checks should suffice and I'm pretty sure that Uber and the other companies do this.