If I have to rely on keeping the billing address a secret, that's pretty messed up. I'm self employed, which over here means that I have to register as a company with the chamber of commerce. Chamber of commerce records are public and include the address of my business (which is my home address).

And obviously most people share their address with various online retailers and friends/family, etc. This is not something I expect to have to keep secret to securely use amazon.com.

(ps. I'm not an iCloud user. But I am a frequest amazon.com user, so I've sent them an e-mail voicing my concerns -- I hope they fix their policies).