Sure - but this holds for public companies, too, especially those with different classes of share. For instance, Drew Houston has >50% voting power for Dropbox,

Sure - but this holds for public companies, too, especially those with different classes of share. For instance, Drew Houston has >50% voting power for Dropbox, despite it being a public company in which he nominally owns <50% of shares. Having investors, even if you own a controlling interest, still has implications on company decisions and possible legal action.