The word "lawful" always seems to get dragged out when people in power are doing some especially heinous rulemaking, like throwing a hissy fit over a single company trying to voluntarily draw a line at domestic surveillance and fully automated killchains.
A private corporation can choose not to sell to the government. A lot of them do exactly this. A lot of hoops to jump through.
However, if they do sell to the government, they shouldn't have some sneaky way to exert control over decision making using their products. We're a country of laws, and for better or for worse, these laws are made by elected officials and those appointed by elected officials.
Why an American company wouldn't want American defense to have the most capable tools at their disposal is a different matter all together, but here we are.
Anthropic wanted the ability to verify compliance whereas OAI and Google are fine with "trust us". Which is how it always is, and always has been.
For better or worse, the government is the one who audits, and has it's own internal systems for self audits. So no one except them tells them what they can or cannot do. The government would never put itself in a position where civilians died because Amodei didn't like the vibe of the case being worked.
In a way it's wild that people are upset that the government didn't put a billionaire megacorp CEO in the drivers seat of intelligence.