Right, but Tesla has vehicles on the road, now, with a high level of autonomy (driving across the country autonomously 96 percent of the time:
http://jalopnik.com/we-set-a-cross-country-record-in-a-telsa...) that are gathering massive amounts of data (40 million/miles/month) from vehicle owners as they drive.
Its an uphill climb for Uber. They will need to fund their vehicles; Tesla funds their battery manufacturing, vehicle manufacturing, and autopilot telemetry corpus buildouts using the vehicles owners have paid for.