Sure, but philosophical musings on the nature of free will aside, there's a practical worry about the amount of power a private company has over your actions. I'd rather be ordering burgers because they taste good than because a company wanted me too--I expect this will lead to greater happiness for me in the long run.
Yes, but only because your happiness metric maximizes when you exercise your freedom of choice.
Other people's happiness metrics work differently, and all popular web services are popular precisely because they satisfy the unconscious desires of the majority of people.
