If having your student loans paid off for you is enough, then there are 10s of millions of people in their shoes. Why did they not succeed if that is what it takes?
Where are you getting the figure that there are 10’s of millions of college grads in their 20’s with no debt? There are only 2 million undergraduate grads in the US every year. I think you’re probably off by a couple orders of magnitude.
short answer: it's might be necessary but not sufficient.
Alex Honnold, the rock climber with some pretty spectacular solo / speed ascents was asked why no-one else has free soloed El Cap, replied "it's hard." he spent a lot of time (years) building up to it and finishing other routes, and no one else has taken these first steps yet. He goes on that they may have the talent or disposition, but not the motivation or an experience that pushes them in another direction. His perspective (similar to general outlier success) is others will do it but it takes a bunch of things all coming together, including luck.
Bill Gates mother worked with IBM CEO. Without her maybe IBM would choose other company than Microsoft.