There are lots of ways around that. His stock is worthless, sure, but he probably has something else, whether it's a huge retention bonus (cash or Fitbit stock,

There are lots of ways around that. His stock is worthless, sure, but he probably has something else, whether it's a huge retention bonus (cash or Fitbit stock, which is public and can be sold), an executive-level salary at Fitbit, or some combination of the two. There's also the possibility that he sold some of his equity to investors for cash earlier on. EDIT: I was wrong, he is joining YC. Thank you for pointing that out kobeya.