They could easily take the weights if they wanted. I don't believe they meaningfully lost access.
the success of mythos isn't from model weights, it's from the harness and toolset it has access to
If they use the defence production act, would Dario be even able to resign in protest?
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Who will make them the next set of weights?
If a government can just seize the product of someone else's labour, either they will end up as slave owners or without willing workers.