The math behind Amazon blocking Muse to shop on their site should mass-humble every company launching personal AI assistants. In 2025, Amazon recorded US$269.3 billion in online-store revenue. It also collected US$172.2 billion from services to third-party sellers. That’s about $441.5 billion flowing through Amazon, almost half a trillion. Now picture the customer trying to buy a chair through an agent instead of going to Amazon themselves. The customer may have authorized the agent. But…