I think you fundamentally misunderstand what kind of company Anthropic is. I'm simply taking the path of least resistance when understanding what people at Anthropic have to say, and basically every public source points to Anthropic talking the talk as well as walking the walk with regards to AI safety and their ideas on AI governance.
Re the point on returning shareholder value, Anthropic is a PBC:
> Public Benefit Purpose: Under Delaware law, a PBC allows directors to legally weigh social and public good alongside maximizing profit for stockholders
Investors surely know this and Anthropic probably has pretty reasonable legal grounds to stand on if they chose to prioritize safety over profits.
Seems pretty clear to me that this is in earnest.