http://www.dedoimedo.com/computers/free-apps-response.html
... The conclusion is, paraphrasing, free software is dangerous, especially when the end product is you, ergo free. In other words, you get free goods, but the loaded malware, spyware, adware, and other crap that comes with the free stuff actually uses you to benefit advertisers and other companies. Ergo, not free. But this is not quite accurate, which is why I decided to write this response.