People don't know how to rate products. Letting them rate how much they trust Alice fir X and Bob for Y is a UX nightmare.
Why ask users to do something (they can't) that competing algorithms could probably do a waaaay better job at?
Almost all data is public and users literally spend money on what they wanna see more of.
Even the most simple algo nostr:npub1l2vyh47mk2p0qlsku7hg0vn29faehy9hy34ygaclpn66ukqp3afqutajft could come up with after children bedtime would do better job then humans indicating trust levels ever could.