Edit:
Data source 2: 5 star ratings of the widget from stores A, B, C, and D, plus 0-100 point ratings from store E written by some pain in the ass nonconformist weirdo dev who uses a different format for reasons you may or may not agree with or even understand
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Answer: the grapevine method synthesizes all these data sources into a single score. If you want to buy a widget and your fav nostr store has listings of 1000 widgets from 1000 vendors, why not use ALL of the above data sources to rank those 1000 products from top to bottom?
That's a complicated set of math to do.