Not entering in the actual issue, just noticing that every time one needs to make an example of a wildly successful company, most of the times is Airbnb and Dro

Not entering in the actual issue, just noticing that every time one needs to make an example of a wildly successful company, most of the times is Airbnb and Dropbox. I know full well that there are many more examples, but I think the total of millionaire-making companies compared to the total is abysmal. Does it mean that only those at Airbnb and Dropbox (and Whatsapp, Twitter, etc...) worked hard and well ? I think luck still plays a role. Working hard and solving problems is a necessary condition, not sufficient.