Randy Murray writing about the free business model in an article titled The Mistake of Free:
Free can work, for a short period of time, perhaps even decades, but only when it hides something else that is the true business model. We fall for the con over and over again. There’s always a hidden cost built into that business model, and unfortunately, that hidden cost is almost without exception advertising and the loss of privacy. For decades advertising was omnipresent, on TV, in magazines, on billboards. Everywhere. It seemed innocuous. It was blasted out at us, all of us, a wide net trying to collect a few customers. Frankly, that was OK. We could live with that. But now advertising is focused, based upon detailed profiles of individuals. Advertising tracks you, targets you, seeks you out.
There are so many potential quotes in that article. Definitely a recommended read.