Why do you think they are pumping dozens of billions into cloud and especially AI? At its heart, according to the founders, Google is not a search company, and not an ad company. Their primary long term goal is the creation of real artificial intelligence. The ad business provides the money. The money buys the best people and all the infrastructure. The user-facing business provides the data. By all accounts you need a trillion dollar setup, as much talent as you can , and pretty much all the data in the world to get started.