Origin "On the House"

So I was looking at Kotkau and saw an article for a free copy BF3 (I already own it). Turns out Origin is giving a way a free game a month. You can pick up Battlefield 3 and Plants VS Zombies for free. I don't use Origin very often, but giving away free games might change that. Smart move EA!

www.origin.com/en-us/store/free-games/on-the-house

lifehacker.com/download-free-aaa-compute...ins-on-th-1570077659

Really cool of them, sounds like they are going to have different free games available from time to time. I wonder if it's going to be a rotation or if it will be something new everytime. I'm not familiar enough with Origin's library, isn't it mostly just their (EA) games that they offer?