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Smokey, quite simple really: Google caches content only as a part and parcel of their job as a search engine. Dumbasses use the content and use it to fill pages to mislead or misdirect surfers, hoping to get them to click onto their banner farm, redirect, virus infection site, or console hell. They have no intention of delivering the surfer to the site they are looking for.
Google removed those sites daily, no problem. If the content presented to google was different from what a surfer would get (redirect) or a significant part of the pages are "unlinked links" attempting to fill google with useless pages, well, they get shitcanned pretty much directly. Google doesn't like spam, and doesn't like sites created to trick them into giving artificial high listings.
The only things that they will not remove are the sites that have valid and correct links to other pages on them in the format of a search engine result or link site. However, they will take action if the links on the page are obviously not in keeping with the title and tags of the page, or if there are thousands of pages on the same domain that are misleading or incorrect.
Alex
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