And so the narrative changed, from:
"through the magic of {pixie dust technology} we can make providing chauffeur services so cheap it would be hugely profitable"
to
"we will replace all the human drivers with robots, any day now"
Of course, that future was much, much further away than purported, but it certainly was useful for pumping up optimism in a company where the present-day situation isn't necessarily favorable.
FB's money-printing products seem to be facing major headwinds. They're scandal-wracked, user growth is plateauing heavily especially in the most profitable markets, and a fast-moving competitor is rapidly eating into their most coveted growth areas and they seem unable to convincingly fight the trend. A narrative shift is certainly needed for them.