Is there anyone who has succerded in building a client that uses web of trust or is it still a theoretical concept?

Does it work without centralization? I know about the vertex search engine and the follow graph in Iris.

nostr:nprofile1qqsy2ga7trfetvd3j65m3jptqw9k39wtq2mg85xz2w542p5dhg06e5qpzdmhxue69uhhvct4d36zu6tjd9ejuar0w3mpq9 does the graph work well and do you think it's useful?