They make it big because they are networked with the sorts of people who have money to spend (either by being a former employee of an acquisition-happy company, or being pre-vetted by a group like YCombinator). Based on other articles of this type, they also make money because they are young, they are pretty, they went to Stanford or MIT, they live in Silicone Valley, they had a good idea, they were able to pivot in just the right way, they have no other commitments -- no spouse, no kids, no mortgage -- or ties, etc...
Sure, they "worked until they endangered their health".. but they were also the lucky 0.0001% that had everything else line up so that hard work was all they needed.
Reading this sort of thing is a drag for those of us who do not have any of those advantages. Who try year after year to support a family and also find a business that can actually work out. (got another idea last week... looking to feel out some potential customers ... wish me luck!)
So, uh, yeah.... I should stop reading these kinds of articles