We do plan to note changes in the policies. Considered a feature that lets you subscribe to the policies you are interested in and get notices if they change, or if in the news, it is mentioned that the site loses your data. What do you think?
I'd love a site that stored diffs off all legal docs for large organizations. I was trying to find old TOS of amazon.com the other day, and couldn't find them anywhere.
Diffs of privacy policies would be excellent! And notifications as well.