The point of why "it's so special" is that:
1) a browser contains all the information marketing firms and companies kill for. The buying habits of billions of people, hell it contains more than that: it contains all sorts of data about what exactly makes people buy.
2) OpenAI's browser generates excitement and might actually make this information available for OpenAI to sell
3) This would be a totally new revenue stream for OpenAI, maybe a dozen new revenue streams