I think we need to define "decentralized" here

Google in and of itself is decentralized from an engineering perspective. There's no giga-computer in Mountain View that all search requests funnel though. It's a highly distributed system, much like the internet itself - just a distributed system that a single entity controls.

The issue isn't central or decentralized systems or engineering. It's centralized OWNERSHIP and CONTROL. That is the aspect that needs to get cracked open... what a monopoly is to a capitalism, is what this is to the internet.