It does not apply to founders. I could move to the USA and take someone's job there, but it is impossible to bring my business to the USA and employee Americans and pay masses of taxes to the U.S. Government. Visas are one area where Australia leads the USA.
The E3 requires employer sponsorship and doesn't offer a ready path to a green card, so it isn't friendly to starting a company in the US. It is fairly easy to get because it has its own special quota just for Australians so they do not need to compete with immigrants from other countries as for an H1.