It was their job to make sure humans are safe from OpenAI's superintelligence. They just quit.

• Machine learning researcher Jan Leike and scientist Ilya Sutskever just resigned from OpenAI.
• Their team's job, essentially, was to make sure humans are safe from OpenAI's superintelligence.
• The team was racing to make sure AI remains aligned with mankind's interests.

It's too soon to say what major departures at OpenAI mean for the company, or if Sam Altman plans to replace the people in these roles with new staffers. But this isn't a great day for AI doomsayers.