[ultramancool]

There's a wide variety of these "Pay-Per-Install" (PPI) type services, all of which profit by installing some form of malware on your machine. Sketchier services pay more, but also install stealthily rather than asking. Any kind is a pretty disturbing way to profit from your users. They're the kind of things you see script kiddies deploy to a small botnet. Not something you expect from a legitimate company.