Google has a financial incentive to want latency online to be lower. The more people use the internet for things, the more ad money they can make. By offering t

Google has a financial incentive to want latency online to be lower. The more people use the internet for things, the more ad money they can make. By offering their own DNS service, they can lower the DNS latency for some people, and goad competing DNS services into becoming faster as well. I doubt that running Google DNS costs a huge amount of money, so the incentive to Google can be pretty subtle and still be worthwhile.