Not saying I agree that being closed source is in the public good, although one could certainly argue that accelerating the efforts of bad actors to catch up would not be a positive.
If that was true, then they shouldn't have started off like that to begin with. You can't have it both ways. Either you are pursuing your goal to be open (as the name implies) or the way you set yourself up was ill-suited all along.
That gives a lot of leeway for honest or dishonest intent.
From their charter: “resulting technology will benefit the public and the corporation will seek to open source technology for the public benefit when applicable. The corporation is not organized for the private gain of any person"
I just thought it might be important to provide more context. See the other comments for a discussion on "when applicable". I think this misses the point here.