None at all. You can use them without ever telling them your name. Take the Home option and then Premium DNS, then the orange "Get Started" button if you really want to set up an account with them. But making use of their services is as simple as replacing two IP addresses in your system's internet configuration -- the addresses in the "Completely Free" box right over the "Get Started Button".
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.