I imagine a reason that WPEngine has been relatively quiet is that they have competent legal counsel who have advised them to remain silent. While WPE has let their lawyers handle things, Matt has refused to shut up and, consequently, has fueled the drama and arguably put himself in a worse position legally.
I wonder if they will ever say anything, though. I'm honestly kind of tired of seeing posts about WP drama on several different platforms, and this has been going on for weeks. I had to unsubscribe from #wordpress on Mastodon because almost every post was about this...
