All of these folks have a lot of such data, but they're hardly just sitting on it. Amazon uses it to push product; Google uses it to measure and improve both or

All of these folks have a lot of such data, but they're hardly just sitting on it. Amazon uses it to push product; Google uses it to measure and improve both organic results and paid advertising; etc. It would be great to have broader access to this data, and I believe the privacy concerns can be addressed. But it would be asking a lot of these folks to share what may be their most valuable intellectual property: what they've learned from their users.