Most fail for lots of reasons, insufficient capital is only one of them. Another large reason is incompetent accounting - i.e. having a poor grasp of their financial situation. This is often confused with insufficient capital.

Besides, anyone can start a business with essentially zero capital. One can mow lawns, do babysitting, maid service, write apps, write a novel, etc. The only capital I invested in my own business startup was buying a computer.

Search Amazon books for "starting a business with no money" for lots of ideas.