Has anyone applied to YCombinator, been rejected, then built something popular?
There was a line from the rejection email:
"We realize this process is fraught with error. It's practically certain that groups we rejected will go on to create successful startups. If you do, we'd appreciate it if you'd send us an email making fun of us; we want to learn from our mistakes."
Has anyone done that? If not, YCombinator picks the winners pretty well.