12 Paid Links Are Spam
Buying links is considered spammy by Google because it is a ranking short cut which subverts search relevancy algorithms.
And so Google considers it a black hat SEO practice.
Links are somewhat hard to scale because (outside of those who create a network of spam) it is time intensive to find the right sites, negotiate a price, and then ensure appropriate placement. It requires interacting with many webmasters & going through a lot of rejections to get a few yes responses. Due to scale limitations, paid links typically only exert a slight influence on core industry keywords and common variations, limiting any potential relevancy damage.
Further, when a person buys a link, the relevancy is almost always guaranteed (as one would go broke fast if they rented links targeting irrelevant keywords).
Even still, Google hates paid links because they can lower result diversity & bias the organic search results away from being informational and towards being commercial (which in turn means that Google AdWords ads get fewer clicks).
Policing Paid LinksTo make link building efforts easier to police, Google created nofollow, which aimed to disrupt the flow of link equity across certain links. Initially the alleged purpose was blocking comment spam. And then after it was in place, comment spam never went away, but the role of rel
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