Can't you just lie?
Surely the reasoning behind google offering its services for free is that the user submits information which can then be used to sell them something. Until google has a way of verifying what its users tell them is the truth...anyone not wishing to give too much away can simply tell them porky pies. Can't they?
Even capturing the data must be fraught with difficulties, given the infinite idiot factor involved with allowing joe public to submit their own content to the web (facebook, myspace, flickr et al).
And ultimately, what no-one is asking here is what kind of person is going to rely on a the web to make their decisions for them, once the initial novelty has worn off?
The very concept is a load of tits.