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if filter #1 penalized the whole web then there would be no net penalty as it would cover the whole web fairly comprehensively (except the sites that bought link popularity and did not link out to other sites)
to offset something like that they would need to penalize sites that lacked outbound links.
filter 2 would be hard to apply the way you are stating since the page the link is on may not match the theme of the site and it would be hard to determine the theme of each and every page on the site quickly just to evaluate 1 link
filter 3 may work, but the spam penalty would be better matched against other things than just a keyword.
i would love to go to school to learn how to better structure unstructured data.
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