It's interesting that PageRank was originally envisioned as a way to rank academic papers. Now it's failing on caramelizing onions, which doesn't seem like a s

It's interesting that PageRank was originally envisioned as a way to rank academic papers. Now it's failing on caramelizing onions, which doesn't seem like a subject anybody profits by spreading misinformation about. What does this say about how we use citation metrics in academia?