"Musk says that before the company became successful, he could not afford an apartment and instead rented an office and slept on the couch and showered at the YMCA, and shared one computer with his brother."
He made his initial money on an internet startup. Nothing wrong with that.
Wikipedia quotes Elon Musk saying something, and we take it at face value? Let's apply some collegiate (or otherwise) critical thinking about our sources.