It's the quality of the data and what you do with it that really matters. I think the benefits of crowdsourcing driving data to develop autopilot have been overstated. Waymo has pointed out that they are making the lion's share of their progress testing in simulators, where they can play out every conceivable variation of some strange or difficult edge case in a way that is not feasible in the real world.

One thing you can do with 1000s of fleet vehicles is begin untangling the logistics of running a publicly accessible robotaxi network, which will brings with it a whole new set of problems above and beyond the autonomous os itself.