InstallMonetizer were in the Winter 2012 YC batch (according to their site & TechCrunch), but they've been around since mid 2010. The YC folks had to know that

InstallMonetizer were in the Winter 2012 YC batch (according to their site & TechCrunch), but they've been around since mid 2010. The YC folks had to know that installing toolbars was InstallMonetizer's business model... surely? I don't want to hate on YC, I was just very surprised to hear they'd invested in this company, and I'm interested to hear what their reasons were.