Links to undesirables.
Everyone that knows CoolWebSearch doesn't want to even get close to a site associated with them and their malicious browser hijack codes.
Google seems to be doing something ethical by not listing sites with a link to CoolWebSearch.
Here are the stats for sites listed containing CoolWebSearch links:
coolwebsearch.com linking sites.
Looks pretty obvious. Link to CoolWebSearch. Die on Google.
I think the is a great step in the right direction against malware.
P.S. Google also ranks best by far with the least listings to Gator linked sites.