Google has updated its algorithms to specifically target websites that abuse paid links for marketing and SEO purposes. This "link spam update" aims to more effectively identify abusive link behavior and specifically downgrade affected websites. While the update aims to nullify problematic links rather than punish websites, the end result is similar to being penalized as it removes the ranking boost from those links. Websites that see a major drop in rankings after this update may have been impacted. It is best for SEO to focus on high-quality original content and a good user experience rather than manipulative tactics.