> Whoever at Prezi manages this UI should definitely clean it up to actually say that, but the behavior itself doesn’t seem crazy to me.
IMO they ought to change it from a single checkbox to a pair of radio buttons, and give something along the following as options:
“You are about to cancel your subscription. However, you have x private presentations in your account. Private presentations are not available without a paid subscription. How would you like to handle this?”
(_) Delete all x of my private presentations
(_) Make all x of my private presentations public
And then have a button or link as well where you can go if you wish to review your private presentations in order to delete any of them prior to making the remainder public.
Also, in the listing of private presentations, provide a button or link that allows you to download a copy of each of them before you delete them.