This is very short and explains exactly what they want: https://openai.com/charter

I think it's pretty obvious after reading it why people who were really committed to that Charter weren't happy with the direction that Sam was taking the company.

It doesn't sound obvious to me, can you clarify on what Sam was doing that went against the charter?

Looking on Windows 11 and Copilot, it’s easy to see that Microsoft deal violates “Broadly distributed benefits” on some level. But of course, who knows without an official statement.