The flip side of that is that people who don't provide that information are going to be grouped into a pool of relatively high risk people and be forced to pay higher bills. And the incentives line up such that, if you're better than the average non-sharer of personal information, you'll be significantly better off switching to being a sharer, which in turn increases the risk profile of the remaining non-sharers. And the cycle repeats until no one can afford not to share all their information.
And the same cycle will push insurance companies further and further into your personal life. Oh, you play video games a couple hours a week? That's $15 extra/month. Oh, you prefer watching football to watching the Wire? We'll ring you up for $5 extra/month. You're gay, that's $10/month. You married a person with an above average BMI? Well, that puts you into a higher risk profile, you'll see the charge on your next bill. Look, Aetna's new monthly offer: a purely voluntary opportunity for you to lower your insurance bill by up to 30%, just by installing a chip into the base of your skull and video cameras throughout your home, all paid for by the Company!
And the insurance companies that don't do this will face higher costs and lower profitability, eventually pushing them out of the market.