Your position seems to be based on lack of knowledge of the fact that the US government has broad authority to regulate AI services under existing national security and export control powers.
You can argue that those powers are wrong, but these powers are well-established and perfectly legal.
Anthropic could challenge these in court but, from what I've read, most attorneys specializing in this area of law believe it would face an uphill battle in courts because the related powers are so broad and well-established.