EEE, astroturfing and similar bait and switch tactics has been so common for decades that some companies are guilty until proven innocent.
The only company I can think of that EEE-as-a-strategy might apply to is AWS, and I say this with huge reservations because their priority is still their customers.
Far as open-sourcing their stuff, I think they're holding off on that to preserve their profitable lock-in in legacy market. Harder to clone their key dependencies if the code isn't open. Even opening the data formats like for Office wasn't enough to make a copy that renders all existing documents perfectly. That was by design, too.
I think it makes more financial sense for them to keep existing stuff closed followed by Embrace with Microsoft-oriented Extend on open stuff. I doubt they'll Extinguish since they don't have enough clout to do that in this market. Probably in most markets now.
Ah the only second ISO Standard for the same thing. With transparent definitions like: if option XYZ is set, render the output like Word 97.
Blatant corruption by a standard gremium.