Behind the block of Fable and Mythos, the alleged jailbreak is not the only reason. According to an anonymous source, China had access to Mythos.

The U.S. government ordered Anthropic to pull Fable 5 and Mythos 5 over national security concerns just days after its CEO called for exactly this kind of oversight.

Anthropic said it received a government directive banning all foreign nationals, even those working at Anthropic, from accessing Fable 5 and Mythos 5 over national security…