It's the JOB of the media to hold these companies accountable and to be transparent when they cooperate with these kinds of things. When the media does its job properly, as in this instance, you don't need Gamergate to do anything.
The fault in your reasoning lies in that you're expecting Gamergate to take over the job of these news outlets and to do their work for them. ABSOLUTELY NOT. Gamergate will continue to scrutinize the media for wrongdoing, and point them out when they abandon their responsibilities.