Backbone routing on the internet has nothing to do with "chosing the least congested path" and everything to do with "hot potato": ie: hading the packet to another network and soon as possible.
BGP (Border Gateway Protocol) which is used for 99% of inter-provider backbone routing on the internet looks primarily for the shortest path in terms of number of networks to traverse to the destination.
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Backbone routing on the internet has nothing to do with "chosing the least congested path" and everything to do with "hot potato": ie: hading the packet to another network and soon as possible.
BGP (Border Gateway Protocol) which is used for 99% of inter-provider backbone routing on the internet looks primarily for the shortest path in terms of number of networks to traverse to the destination.