wp-hackers angst about some company repackaging WP and selling it on without explicitly stating what it is.

Whatever the morals of this, the code itself remains open-source by virtue of being PHP and, you know, editable in Notepad; so as long as they keep some form of credit tucked away in a random text file nobody ever reads, you can’t touch them. It’s GPL, you have no rights. The developers are fine with this (who needs intellectual property when you have venture capital?) so I’m not sure why anyone else needs to worry about it.