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I mean they cache it all via CDN. In some cases that means they’ve got 1000 copies of a popular show sitting on CDNs around the world, and in some cases that means they are dynamically pushing content to CDNs on demand.
Storing is done once by simply offering a 4k option*.
Bandwidth is an ongoing cost per view, but no where near the increased plan cost to cover it.
*technically more than once because of distributed CDNs which would need to scale to demand. But negligible.
I mean they cache it all via CDN. In some cases that means they’ve got 1000 copies of a popular show sitting on CDNs around the world, and in some cases that means they are dynamically pushing content to CDNs on demand.