archive.org collects web pages for its archive. It has some method of allowing an organization to "exclude" their content. How does the owner of the site change from "excluded" to "included"?
Note that this appears not to be simply a
robots.txt file issue. For example, digital.com's page shows:
Sorry. This URL has been excluded from the Wayback Machine.
whereas, fb.com's page displays:
Page cannot be crawled or displayed due to robots.txt. See fb.com robots.txt page. Learn more about robots.txt.