Yahoo’s gambling results are sometimes good but usually very poor. They have a major problem with sniffing out miniwebs of related sites. They have even resorted to using Google results (which they still have the rights to) for the first twenty or so results for some specific searches.
So, no matter what they have a long way to go. However, I don’t see them particularly going after crosslinked networks this update. Of course both Google and Yahoo have it as a priority to root out these “set of themed domains”, so the days for those are numbered, even if many are still hanging on.