So my bet is either they lied about how they are using customer data, covered up a massive data breach or something similar to that. The only thing that's a bit hard to figure there is how specific this is to Altman. A big scandal would be leaking out I would think and more people would be getting fired.
Microsoft had inside information about their security, which is why they restricted access. Meanwhile, every other enterprise and gov organisation using ChatGPT is exposed.