Buying backlinks for SEO has been around ever since search engines used links as a ranking factor, especially Google’s PageRank algorithm. Google has always said that they are against buying and selling links for ranking purposes and they have done a better job in identifying links that are bought.
However, buying links is still a common practice. This is because many say that they have experienced success using this strategy and it is one of the quickest ways to increase their website’s authority. But of course, it comes with risks.