I guess there should be a separate page listing all YC funded companies (if you can have pages listing all characters in tv series, why not companies funded by YC?).
Because the standard of 'notability' is bogus when applied to something of the supposed scope of wikipedia. It's impossible to apply it with any reasonable consistency, and it always boils down to a few biased opinions, which is why the topic of notability deletions is so sensitive.
