I believe this[1] is the article in which the author, Matt Levine, introduced the phrase “blood unicorn”. That article continues with a quote about Theranos's “bait and switch”; the author concludes the section with “‘There will be an appropriate time and place to talk about the past,’ said Theranos; my guess is that the place might be court.”

EDIT: This article[2] (also by Matt Levine) predates [1]. “And here is a unicorn being barbecued in what looks like a medieval manuscript that I will just assume prophesies the coming of Theranos. ‘And lo, a Unicorne shall come among ye, and ye shall call it by the name Theranos, or in the Old Tongues, Elasmotherium Haimatos. And it shall take your Bloode, but only a lyttle bit of your Bloode, and it shall do strange Magick upon said Bloode, and tell ye many Things. But then it shall come to pass that its Magick was [makes 'so-so' hand gesture], and that those Things were mostly not true. And ye shall barbecue that Unicorne.’”

[1] https://www.bloomberg.com/view/articles/2016-08-02/mergers-u...

[2] https://www.bloomberg.com/view/articles/2016-05-26/libor-cha...