Calling out Matt and Automattic for their abusive behavior is addressing the systemic issue of for-profit corporations exploitatively abusing open source software.
We're talking about a company that released GPL software, waited a decade for another company to build their entire business around said GPL software, and then came at them with threats of going to "nuclear war" (their words) with them if they didn't agree to extremely exploitative terms on top of the GPL licensing under which the software was released.
That is the affront to Free Software that's happening here. WP Engine may or may not be a good company, but it is Matt who has given up on freedom. If you lure people in with a promise of Free Software and then hold a gun to their head when they take you up on it, you are the bad guy.