Personally, I don't see any reason why it should annoy anyone. It is the only place you see any advertisements and you only ever see it when the About dialog is shown (on start up or manually). It doesn't force a user to do anything, nor from what I've seen are the ads in any way offensive.
Granted, I'm registered, so I don't see those. Still, I found the popup of the webpage every so often more annoying than those ads when I had it running unregistered.
