Brian, always good to have a mindset to reach your goals and not let rejection throw you off course. Coming from a success story this is interesting and valid advice.
However I’d advise Airbnb to think back to these mails from where you are now and behave accordingly. I’ve heard from multiple sources in my network about rejections to applications. While I strongly assume there are smart people at work, so are the profiles of those who applied — if you wish to have been given a chance by these 7 investors, your hiring behaviour should ideally reflect this culture, too. Wishing you the best in further growth.