[wslh]

There is an easy contrarian view about decentralization: even if a decentralized protocol wins, at the end it is all about the UI/UX/Aggregation which clearly cannot be decentralized. For example, OpenBazaar can be great but the one who develop the best UI and search engine will win.

[amelius]

There is a semi-centralized solution: make search run on a handful of central machines, and check if the results of (e.g.) two of them match.

[fghtr]

This problem is essentially solved by YaCy: http://yacy.net

[wslh]

I don't think you both understood what I said. It does not matter if you can find a decentralized solution to a problem because at the end the user will access it through an UI/UX/App that, in you example, can choose how to rank the search results beyond what the protocol dictates.

In the past people used the simple "mail" command to read emails but now they choose GMail or others because the UI/UX (or any other reason) is better or they like it more. The SMTP (federated) protocol is hidden.