I'm late to reply, but in Austria the postal service happens to offer multiple services similar to this. You can rent a "post box" for letters or packages. You

I'm late to reply, but in Austria the postal service happens to offer multiple services similar to this. You can rent a "post box" for letters or packages. You pay a monthly fee and get a post box number. You provide your post box number instead of the address, and then you can pick up your mail from the post office. They also have a forwarding service. Same thing but they deliver it to your home. Also, many online stores let you deliver directly to a post office or even to self service pick up stations. So there are ways to shop online without providing your address. But these services are not used very much. I guess most people don't care as much about the secrecy of their address.