MFA term explained
MFA is a site called websites that were created to accommodate and earnings on advertising (Made For Ads or Made For AdSense).
Generally, MFA is the template sites created in haste, with poor (low-quality) content and many pages. MFA sites are created specially for search engines, search engines are the main source of traffic (more than 80% of all visitors come from search).
The sites are of no value to the user, and are motivated only go to one of the sponsored links. Thus, visitors are perceived as traffic and the main goal is the monetization of traffic with minimal effort.
Search engines are trying to filter out MFA sites that show them below the others in the search results. Especially serious is filtering MFA sites by Google.