The are big players in Internet business, but they are not big enough consumers to benefit economically from owning chips. Even if they will be all combined, they will not be even a double digit of top tier Xeon buyers.
And this is partly the reason why AMD was so keen on playing ball with them. AMD among other things was making a proprietary CPU for Amazon, which the later discarded. It was later rebranded Seattle, and thrown on the open market.