Bots would keep retrying to access the site more frequently than real users would. Poorly written bots would do the refreshing at even intervals.
If @puttitout used his session cookies and a logger, he would have a nice little database of all the poorly scripted bots.
This would go along with the fact that people can't delete their accounts any more.
My first thought was this was just another half-assed hack when putt was away. But this theory fits better with what I know now.