EA often provides free games 'On the house' via origin, it appears to be every month. Sim City 2000, Bejewelled 3, and Peggle have all been free over the last few months. The Ultimate Collection of the Sims 2 was free back in July, every expansion pack would of cost a LOT of money a few years ago. Some may disagree with the DRM inclusion, but you can't really complain when it's free.
Fortunately for us, the past few days of TH being free has brought new users and more interest to CorsixTH.