Well, in that case Amazon needs to hire better backbone engineers. For anycast they should always be announcing both covering routes and de-aggregated routes.

Well, in that case Amazon needs to hire better backbone engineers. For anycast they should always be announcing both covering routes and de-aggregated routes. They should also be constantly monitoring views of AWS network from other BGP speaking networks, allowing them to immediately detect such poisoning. If other important BGP speaking network does not want to provide them the view, they can go to a single-homed with BGP customer of such network and buy the view.