Interesting. I'm assuming Google's only source of revenue with the product would be targeted advertising? I mean they can't charge for access to the content I assume. So I'm not sure why they wouldn't be able to crawl the contents of the Gutenberg archive and deliver ads based on what people are reading/searching for. Just seems like a lot of duplicate effort.
I assume the grassroots nature of Gutenberg is the major reason. Less control is always a scary proposition for a business.