Why is this getting aggressively downvoted? Ironically, there's literally a 2010 math paper entitled "PageRank: Standing on the shoulders of giants[1]."
Same could be said about most innovations; Turing's machine, for example, relies on the work of other mathematicians/logicians. It is true that knowledge is collectively built while profits are only enjoyed by few but PageRank was unique in its own right.
and what upper/lower bound can you put to the share of value that you would assign to the ability to and effort of gathering "thousands of giants" and orienting them towards some useful direction, rather than being hands on?
Larry and Sergey also stood on the shoulders of those giants, but they made a lot more money off it than you did.