Google seems to have a pretty authoritative monopoly on search right now, which is not decentralized at all. We are safe in the sense of Google failing, as there are half a dozen other mostly decent search engines - that's not sufficient though. If Google starts censoring right-wing websites or favoriting their own political agenda in their search results, would we even know? We would not! There's no transparency into the system.

I guess really the term I am looking for is 'trustless'. I don't want to have to trust Google to do the right thing, I just want it to be manifest that there is no manipulation, and no single point of failure.