Ahhh. That could be it. I didn't realize it was a defined economic term. I thought it meant creating an artificial monopoly to grab a market, lock users into the benefits, deny competition via that tech, and make a financial killing in the process.
If I was wrong, I take back the critique based on artificial scarcity but keep it based on monopoly. PageRank was simply too good to beat. Patenting it led to their billions and continued dominance. They did smart things on top of that success. They might have not pulled it off without being monopolistic about search, though.
"a public-PageRank Google doesn't even come close."
How? It let them dominate search, control much ad revenue, put players with most money on top results, create a major contender in browsing, and later dominate mobile market. All that came from PageRank being both good and patented.