Isn't it just the law? Not obvious that terms such as "Wordpress Host" violate nominative fair use. They're commonly used throughout the industry as well.
Yes, it's basic trademark law. Matt's supporters are deliberately trying to obfuscate several issues to make it look like Matt is in the right.
Matt's was alleging violations of the license and the trademark. And he's wrong on both accounts.
I would like to understand what "[t]he use of which were already allowed under the existing open source licenses..." from the preceding comment meant.
I'm not a lawyer. Nominative fair use is complicated, as is WPE's use of the WP marks. All I can hope for here is to understand what claims people are making.