Due to the high traffic volume, they peer with most large providers. Of course they need to pay rent on the fiber that they rent between DCs and peering points,

Due to the high traffic volume, they peer with most large providers. Of course they need to pay rent on the fiber that they rent between DCs and peering points, but at this level the cost should be rather low. And a lot of the traffic will be free, especially in Europe where you can peer with many providers on exchanges.