Google AdSense has sent couple of emails out to publishers believed to be doing arbitrage or serving MFA (Make for AdSense) sites. These publishers account will be terminated with immediate effect on the 1st of June, but the good news is Google will still pay whatever earnings remaining. However, there has not been any official announcement from the Google  If you are playing arbitrage or serving multiple MFA sites to earn from Google AdSense previously, this is definitely a bad news for you. Jennifer of Jensense pointed out an interesting possibility that these publishers might just mass migrate to Yahoo Publisher Network?

Here’s more reading on Google disabling arbitrage publishers

• Jensense - Google AdSense disabling arbitrage publisher accounts as of June 1st
• Labnol - Google AdSense Adwords Arbitrage
• Marketing Pilgrim - AdSense Disabling Arbitrage & MFA Accounts
• Shoemoney - AdSense Arbitrage - Just the Facts