It didn't used to be underserved. We used to have taxis.
And while taxis didn't always like to pick up people in low-traffic areas, they always came for medical transports because they could bill insurance companies extra.
Who is this “we”? Back in the day my town (college town of ~100k) had lime 5 taxis total, and they mostly
Only worked fri/sat night hauling the more responsible drunks home.