Anthropic

Anthropic, the US artificial giant giant that seeks to differentiate itself from other AI firms as being the champion of ethics and responsibility, has restricted initial access to its new powerful AI model-cum-agent, Mythos, to 40 organisations.

All of them, except British AI Security Institute, are American.
Reason for the restricted access? Mythos is so powerful that it can detect hidden vulnerabilities in software systems. If hackers get their hands on it, they could wreak havoc.