I don't think they ever wrote anywhere that they have 6,000+ physical servers. Calling a VM (like an EC2 instance) a server is not unusual. For the customers it

I don't think they ever wrote anywhere that they have 6,000+ physical servers. Calling a VM (like an EC2 instance) a server is not unusual. For the customers it was important that the resources, bandwidth and different IPs were available. For that it doesn't matter if it's a physical server.