The fact that it can't keep doing it forever, and its investors expect that if Google is going to keep expanding its headcount and keep spending tons of money that it will produce results.

Nobody would mind if Google just printed money with ads. That is what the trade desk basically does (TTD), and it's a comparatively very small company. Google could be the most profitable company per employee in history if it wanted to, and it wouldn't lose anything from its core money-making functions. Instead, Google wanted to build a grand technology empire.

If you're going to act like a rockstar, when the lights come on, you better be dancing up on the stage. The lights are turning on right now, and I don't think anyone sees anyone dancing.