McGrath says:

The only thing that it is possible to assume about an anonymous GUEST is that it is someone with a screw loose about perceived anonymity

You really don't understand it, do you McGrath?

There are lots of ways to be (practically speaking)anonymous.

Here are a few:

Use someone else's computer

Use an Internet Cafe or library

Use an Internet enabled 'phone booth

Use a proxy (or two)

Connect via a 'pay as you go' mobile phone

etc