That assumption doesn't work for a big chunk of rural and small town America. I make the once-a-week trek to the post office to pick up my mail.

I tried to sign up for the informed delivery service, since it would be nice to know if it's worth my while to make the weekly trip into town, but those stupid KBA questions would never let me through. Verifying you by random, incorrect, data that they somehow scrapped out of the ether seems much less reliable then just letting me show up at the post office with ID in hand to sign up for it.