The Grapevine may be what you’re looking for. The Grapevine enables you and your community to identify who is the most trustworthy, and in what context, so they can help you curate content, facts and information. 

It revolves around the idea of a data model, which could be as simple as a list of nostr apps or a graph of a nostr app categories, but can be as complex as it needs to be.

Here is the walkthrough of a proof of concept for the decentralized curation of a simple list:

https://github.com/wds4/pretty-good/blob/main/appDescriptions/curatedLists/overview.md

Note that there is no single point of failure, bc you are always at the center of your Grapevine.