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They don't just have to build it though; they have to build it fast enough to handle their growth. $2B might not be enough (or it might not even be possible for any amount) to build what they need fast enough to not hamper growth.

Also, by buying from Google, they hedge against lower than expected growth too. If growth doesn't meet expectations, while they're still obligated to spend the $2B, they can re-sell the services for likely close to cost, given they'll be getting a discount.

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