Well, we don't want to LIST spam sites, and we welcome anyone's help trying to clean out such sites that slip through.
But so far as punishing sites because their webmasters send nine billion spam e-mails promoting viagra sites -- we don't do that.
And, really, so far as punishing websites because some jerk submitted them over and over again (spamming our site submittal form) we don't WANT to do even that.
In extreme cases, we reserve that right; and we have exercised it.
Fortunately, most sites that the webmaster is so concerned about promoting that he cares nothing for anyone else -- are pretty far down the underside of the border; and most of the rest are merely borderline. In other words, there's a strong correlation between worthless sites and spamming jerks.
Of the few incidents remaining, quite often (for instance) the webmasters can be contacted warning of the potential for harm that they (or their agents) cause. In almost six years, I recall fewer than a half-dozen cases where the spammer could not be dissuaded without ostracizing the site. All the rejected webmasters I've ever seen in the public forums were rejected either (very rarely) by mistake, or (most often) simply because their sites did not contribute to our categories. I remember maybe one case where a webmaster was such a pestilence that even if the site had been listable, it wouldn't have been listed.
So I say we aren't spam cops. If you like, you can call us spam security guards for the ODP parking lot -- we just do what it takes to protect our editors from harassment on the job.