[NotEvil]

That url is the demo one. I think the author have his own magic url for personal use

[binwiederhier]

Yes that's correct. You control your own destiny. If you choose any of the demo topic names, you may be getting spam. If you choose your username, likely not. If you choose "phil-likes-dogs" then there's almost no chance someone will guess that.

It's just like with passwords.