It sounds like they are following the letter of the GPL but not the spirit. By licensing the PHP under GPL they are complying, but by licensing the CSS and imag

It sounds like they are following the letter of the GPL but not the spirit. By licensing the PHP under GPL they are complying, but by licensing the CSS and image assets under a restrictive license they are activity trying to hinder the PHP from being useful if it were distributed. As the GPL is designed to do. Did they really understand the GPL when they built their business on it?