Apples and Oranges. Hetzner doesn't even have multiple AZ's by AWS's definition - all Hetzners DCs eg Falkenstein 1-14 would be the same AZ zone.

AWS network is designed with a lot more internal capacity and reliability than Hetzner which costs a lot more - multiple uplinks to independent switches, etc.

AWS is also buying current gen network gear which is much more pricey - Hetzner is mostly doing 1 Gig ports or 10 gig at a push which means they can get away with >10 year old switches (if you think they buy new switches I have a bridge you might be interested in buying).

This costs at least an order of magnitude more.