[this_user]

Unless you are literally operating your own servers in a location that you physically control, you are still relying on someone else.

[morj239]

And even in this case you can't rely on your domain registry not to change your DNS without your consent. And there's not really a big chance you own a dedicated IP address.

[techntoke]

Why would your domain registry change your DNS? You can also add multiple NS to a domain.

Additionally, if you're on a business plan then you can get a dedicated IP from your ISP or just host in a data center.