Yeah, you got the point. They are on the list of "reliant on big companies, and one big server". But "support geo-distributed clusters" remains an open task on Google's radar. See here:
Unfortunately, with the existing architecture and infrastructure along with the team resources, they are focusing more on the algorithms of machine intelligence and AI.
I don't think Google has much interest in a decentralized web. Google, along with Facebook, are two of the prime examples of a centralized web.