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disgust - 7:27 pm on Feb 14, 2005 (gmt 0)
there are ways google could try to detect it. there are a lot of them. but all of them can either be patched, or would result in false positives. in any case, as Crash pointed out, Googleguy mentioned the network on another site, and it didn't seem like he was particularly concerned with punishing the network or diminishing the returns it gives. he basically said something along the lines of "if spammy sites creep into the network, you might end up linking to spammy sites- which might impact how google treats your sites." but that's something most members of the network realize (as well as the owner of the network realizes), and there are multiple steps in place used to stop spammy sites from getting in / getting any weight in the network.
the ratings aren't *that* specific though. there are just general categories. think the topmost dmoz categories, or something along those lines.