In one SEO spamming technique, companies paid to have their site listed in the HTML code of a free hit counter. When a webmaster put it on their page, a small link appeared at the bottom, providing a way for sites to artificially accumulate inbound links. This was often done by sites in very competitive industries like online gambling. In 2008, Google removed a number of high-ranking mesothelioma sites that had been using counters from the top results.1
"Matt Cutts Interviewed by Eric Enge". June 16, 2008. Archived from the original on July 22, 2008. https://blogs.perficient.com/2008/06/16/matt-cutts-interviewed-by-eric-enge/ ↩