PageRank is using the stationary distribution of a random walk; that’s very different than just incoming links (which AV did have)
In a way, it ranks a link by its own incoming links (which are ranked by their incoming links etc). It was possible to game AV by setting up 100 sites that points to your own.
In pagerank, you essentially had to convince already popular pages to link to yours.
For a while, google effectively had no spam, and AV had lots. Eventually, spammers learned to game pagerank; the arms race is still on.
In a way, it ranks a link by its own incoming links (which are ranked by their incoming links etc). It was possible to game AV by setting up 100 sites that points to your own.
In pagerank, you essentially had to convince already popular pages to link to yours.
For a while, google effectively had no spam, and AV had lots. Eventually, spammers learned to game pagerank; the arms race is still on.