Aha! But had the Xanadu folks showed up every day, they might have created something more than vaporware, and people might've used their software!

From the linked Wikipedia article:

> Wired magazine published an article called "The Curse of Xanadu", calling Project Xanadu "the longest-running vaporware story in the history of the computer industry".[3] The first attempt at implementation began in 1960, but it was not until 1998 that an incomplete implementation was released. A version described as "a working deliverable", OpenXanadu, was made available in 2014.