There is a specific, unilateral action that he is taking described in the article.

And the "why are they developing AI if they think it's so dangerous" argument is neither new nor persuasive. They're developing it because (1) they think the potential benefits are as great as the potential risks, and they know that if they aren't one of the actors on the frontier (2) they won't be able to propose meaningful solutions and (3) their opinions won't be taken seriously. Amodei is in rooms with powerful people to propose these things because Anthropic is successfully developing frontier models. The heads of various NGOs and advocacy groups that are concerned with AI safety but not themselves working on those systems are... nowhere, writing pamphlets and blogs that not you nor I nor anyone in Congress will ever read.