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the problem with those pages is that if they are fully automated eventually one drug, porn, or casino site eventually stumbles across it.
then their competitors check backlinks.
and then they exploit it until there is no value in that it
gets blacklisted -or-
has too many submissions to where they parse a very small link popularity to any given site -or-
they piss off the site owner and he / she is forced to take it down.
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