From that same Hamilton blog post, skipping the SEC:
Do I Have To File A Registration Statement With The SEC If I Conduct A Direct Public Offering?
Not necessarily. A direct public offering can be structured for a listing on the OTC Markets Pink Sheets, and it can involve a private offering rather than an offering subject to an SEC registration statement.
It is much easier for a public company to locate capital than for a private company.
Funds raised in going public transactions can be used for working capital, research and development, retiring existing indebtedness, acquiring other companies or businesses, or paying suppliers.