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It's really a fine line for AV to walk, they want to eliminate spam, but at the same time when ever they turn up their spam filters they knock out "innocent" sites at the same time (and get many angry emails and posts in forums).
This cazino.net is blatantly spamming with hidden text, but when they change the hex codes enough to aviod detection, how can AV come just turn up the filters without knocking out legitimate sites?