However, what exactly is the sensitive data here? Your first name, your zip code, your car make/model/year, and your profession.
99.99% of people would happily give you that data for a free pen, just for the asking.
Also, while the Leaky guys (being in YC) are likely to actually be better than their privacy policy, what happens when you click over to the actual insurance company and give them your full details (SSN, credit info, vehicle accident history, license info, etc.). I'm more concerned with how AIG will use my data than how a small startup will, and the insurance company is the one collecting vastly more -- and their privacy policy allows them to use it for all sorts of things which are opposed to the user.