According to the Wall Street Journal, the export control directive that led to Anthropic cutting off access to Fable 5 and Mythos 5 was triggered in part by cybersecurity research from Amazon and conversations between CEO Andy Jassy and the White House.
Source: [The Verge](https://www.theverge.com/ai-artificial-intelligence/949601/amazon-anthropic-fablemythos-government-ban)