I have used issuu for years, and have a premium account. However, a recent set of publications which I posted privately have resulted in both requirements that people sign up, and, even worse, a more complicated sign up by phone page. Other pages they have referred me to show broken links.
This has cost me not only a great deal of time and embarassment, but also money. Their response has been only to insist that this is not happening, and to refer me to pages with broken links. Here are the two pages which users of my links arrive at.