wilderness - 12:22 pm on Feb 28, 2013 (gmt 0)
Were User Agent strings differently arranged back then
I should expand on this.
The compliant browser UA's (begins with Mozilla) were quite similar to those currently used.
The harvester/download (aka kiddie tools) were much more abundant, and they did not use the compliant browsers UA's.
That's what made them so easy to stop.