Tesla has over 2 billion miles of autopilot driving data. I am skeptical of the suggestion that more driving data will accelerate or open the door to significant progress. I could easily see more data reducing efficiency and increasing overall costs.

"which Silicon Valley company will consider having thousands of eyes on the road at all times a bad thing?"

Any company that doesn't want it or need it? I'm not sure I see the obviousness. Just because something is cool doesn't mean I want my company spending money on it. What am I missing?

You're missing a wide array of applications, from dystopic surveillance to checking the state of a place (damage, garbage).

Sounds potentially profitable to me.

Of course owners should be able to opt out of that or even be paid for opting in.

Insurance..