Tesla and Waymo are taking very different roads to self-driving cars, and Tesla is betting its cheaper, camera-only approach can win by using its own customers as free test drivers.

• Waymo relies on lidar, radar, cameras, and detailed maps of every area it operates in.
• Tesla uses cameras only and skips the mapping, relying on human drivers to catch mistakes.
• Every time a driver turns off Full Self-Driving, Tesla now forces them to say why, and won't let the prompt go away until they answer.
• Tesla mostly cares about safety and critical interventions, since fixing those rare edge cases is the hard, expensive part.
• Crowdsourcing this data from every Tesla owner is far cheaper than paying employees to find the problems.

Outlook: Tesla's approach could scale faster and cheaper than Waymo's if the crowdsourced fixes work, but it depends on drivers doing the training for free.