$1B is a pretty easy bar to clear.
This almost makes sense. You almost can't risk vulnerabilities even being discovered in certain systems that are impossible to patch, like immutable distributed smart contracts.
Not sure that justifies withholding Mythos access entirely, but what do I know. I apparently got access to Mythos a few days ago since Anthropic folded Project Glasswing into the CVP.
And if a problem is critical enough the community can decide to hard fork and rewrite the contracts source code even if it's immutable. It already happened with the Ethereum DAO hack and most people were okay with it.