I'm not up to date with the state of SF transportation rules and U&L. Are U&L still ignoring rules designed to provide access to those with disabilities?
This article is pretty old at this point (2014) and I don't know if the situation has changed for the better. http://www.sfgate.com/news/article/As-Uber-Lyft-Sidecar-grow...
Ignoring the people with disabilities, as they are more expensive to service is one (problematic) way to lower costs.