They all had co-founders when they started. However, people forget this point because when you think of these great iconic companies, you associate them with a single person usually the CEO who is famous and a bit of a celebrity.
And that is why whenever you think of Apple you get the picture of Steve Jobs or Bill Gates from Microsoft. Over time it’s indeed for one person to drive the company and become the figurehead and stick out for a company for a longer period.
Therefore, this is why we remember those people but we’re talking about the earlier stages of starting a company where all of these founders had co-founders, and together they shared their vision, and goal, and worked together while being dependent on each other.