[Hamuko]

At least AWS is fully aware how premium their normal data transfer is and that one might want to optimise those costs.

[vidarh]

It's extreme enough that I never willingly serve data directly from AWS without a caching proxy elsewhere in front unless the egress is tint.

It takes very low hitrates before it pays for itself several times over including management overheads.

Sometimes you can justify a complete replica outside AWS (one of the things I will gladly pay AWS for is durability)