Congrats on the startup success and (more importantly) I hope your daughter is well. There's a really valuable lesson here for would-be YC founders: > We had high hopes about getting into YC for the winter batch, but were rejected since we only had a non-functional demo of a product and zero traction. ... > This amazing traction helped us get into YC several months later... Same founders - traction = YC rejected Same…
I don't know what the difference was in this particular case, but you're overgeneralizing from it, and underestimating how much emphasis YC places on founders (a lot).
YC funded Dropbox before it launched, because they believed in Drew—so that's a counterexample, no?