Made for AdSense sites are considered sites that are spamming search engines and diluting the search results by providing surfers with less-than-satisfactory search results. The scraped content is considered redundant by the public to that which would be shown by the search engine under normal circumstances, had no MFA website been found in the listings.
Made for AdSense or MFA sites are Web pages created specifically around AdSense keywords. These are often poor quality sites with little or no original content. MFA sites may use content copied or "scraped" from other Web sites or content generated by computer. The goal is to make content geared towards high-paying AdSense keywords. Many MFA sites also profit from arbitrage. Made for AdSense sites are considered sites that are spamming search engines and diluting the search results by providing surfers with less-than-satisfactory search results. The scraped content is considered redundant by the public to that which would be shown by the search engine under normal circumstances, had no MFA website been found in the listings. Currently, Google has not clamped down on this yet but I would recommend not to do this, as they have been alerted of this problem and are very aware of it and most probably trying to do something to stop this and it's not very wise to get your Adsense account shut down just for a few months of profits! But just for the sake of knowledge, these guys have proven how easy it is to make money out of it
The main reason for banning so many people is the sole reason that MFA Websites with Google AdSense Arbitrage are driving mass amounts of traffic and the low quality MFA websites are generating very high CTR (Clickthru Rate) and this is causing very low ROI (Return of Investment) for the AdWords Advertisers. The sole action of closing such sites is one of the biggest efforts from Google to increase the quality of their AdWords advertising program and lower the advertising costs for many advertising clients and therefore try to attract many new advertisers for their network.
It's also IIRC against the AdSense terms of service to create a site solely for the purpose of putting Adsense ads on it. I've created a bunch of these types of sites for clients and they usually don't make much money.
Basically MFA sites are sites which litter their whole website with lots of Adsense ads & other ads with very little content or sometimes none at all and then create Adwords campaign such that they can appear on the 1st few pages of Google's search results pages (SERPs).
It's not like before anymore. Today, MFA are 5-6 pages sites with 5-6 500 words articles in there and adsense ads. It's called niche sites. You choose a niche, for example, the culture of honey in the oriental Andes. Nobody cares but there is 1000 monthly searches. You order 5 X 500 words articles about that and put your adsense. You have a MFA. In this forum, there are literally thousands of people making those niche sites, or MFA without to know they are doing so...
There are many different topics doesn't necessarily mean it's a site made just for ads. Lots of people have an interest in many different things and may write a blog with widely-ranging interests. If they write the articles themselves, and they're well-written and easily readable then it becomes obvious that the person does have an interest in publishing their opinions or experiences, or sharing something else of interest, like original artworks or tutorials. If a blog contains a lot of content that can be found in other places (copied from wikis, other blogs, news sites, books, etc.) it tends to get classified as MFA. After all, if you create a blog that doesn't have any content that you've actually written, or contains none of your own experiences, feelings, thoughts or expertise (everyone has expertise at something)...what are you actually sharing with others? Only things found elsewhere already. It's a little hard to explain I guess - it's really a matter of do you hurry and grab articles you think have "high paying keywords" and fill your site up with that stuff (and we do see lots of that) or do you write about things you have some sort of interest in. The former would be an obvious MFA to us, while the latter would be an honestly written blog with a purpose for existing, besides advertising.
Hello friends, MFA stands for Made for Adsense is one of the blue hat Seo technique, which is specially used for making high quality content for focusing on high-paying Adsense keywords, but it copies that high quality content from the other site, which is totally unethical way. Thanks and regards Smith Jones