For one thing, Wikipedia is international. They have servers in South Korea, the US, and the Netherlands. While EC2 offers three data centers, they're all loc

For one thing, Wikipedia is international. They have servers in South Korea, the US, and the Netherlands. While EC2 offers three data centers, they're all located on the US east coast. It's a consideration when you're running a site as large as Wikipedia that aims for a lot of international traffic.