Right. But it's the second half of the business strategy that I outlined above that's key to the discussion, ie the idea that paying billions of dollars for market share in this field makes sense. That's literally crazy, the network effect and lock-in at scale is really modest at best.

Sure the more cars you have the better the service can be, but it's trivially easy for a competitor to come along at any time and attack your most profitable market segment in a given city, and trivially easy for any customer to switch as easily as clicking on a different app and glancing at the estimated time and price. That's going to be true forever, this isn't a market that will ever have a defensible monopoly position.

Investing some amount to hedge in self-driving cars could conceivably be defensible, but looking at what's going on it feels like that's more of an rationalization for their present behavior.

They've been lighting money on fire subsidizing rides for a few years, and have hunted around for a plausible excuse. One is the "pool" functions, as that has a slightly more plausible network effect story, and the other is self-driving cars.

Both appear to be post-hoc rationalizations designed to provide some plausible story for why they need to borrow another couple billion dollars.