Why Did Kevin Systrom and Mike Krieger Leave Instagram and Facebook?

Mike Krieger told Partners that he and Kevin Systrom stayed six years after Facebook bought Instagram, each only because the other was still there. Every January he chose again whether to stay. At 18 he had promised himself distinct years, not one year on repeat, and the learning had started to diminish. Over dinner he said it might be time to leave. During Kevin's paternity leave he ran part of the CEO job for a couple of months and found he did not want it. He wanted to be bad at something again. They left with no next company, and rest came first. It was their longest silence in nine years.