FWIW, I don’t actually know if board of Anthropic has actual power to replace its CEO or if Dario has retained some form of personal super-control shares Zuckerberg style.
At some level of growth, the dynamics between competent founders and shareholders flip. Even if the board could afford to replace a CEO, it might not be worth it.
I'd counter that at this level of capital, if the CEO doesn't well align with the capital, then super-control shares will be overpowered by super-lawyers and if there is need some super-donations. OpenAI was a public interest company...