[danShumway]

I think the followup question in these cases is whether consumers can get the data _off_ of the main websites.

I do see a decent argument for companies being a little bit more conservative about what information they put in emails when this kind of information collection is largely invisible to the general public. It's just important to balance that against data silo worries by making it easy for customers to export their data and hook purchase confirmations up to other services that users might actually want to have access.

I'm not convinced Amazon makes these kinds of decisions out of a concern for user privacy (especially since Amazon isn't actually consistent about hiding this information in their emails as far as I can tell), but I'm sure some retailers are.