The word "Affiliate" or any word form does not appear in the rules list.
Also, linking to hackers.com does not warrant having illegal content as the very popular site would've been taken down by now if it was. (I mentioned this since it is the closest rule that comes to addressing this situation)
Giz, I would add a rule which doesn't allow advertising a person's site (except when it's a personal website in the webdesign forum maybe). However, when a link is given to an individual as help, then it is perfectly ok. Say, somebody linked to an article on hackers.com which addressed somebody's question. All this is fine.
Don't ya worry about losing members to other boards such as hackers.com. The people who count are loyal.