Google is not an ad company. People just like to say that because they think it's clever or surprising or something. Google does not produce ads. They sell ad space. So does Facebook. So does NBC. These are product companies selling ad space.
Anyone know what proportion of their revenue comes from ad placement on their own product pages?
>Are you aware that Google runs an entire ad network?
Which would mean that they would want to keep such third party sites interesting, fast and high quality as well. Chrome, Analytics and their other similar products/services are hence justified.