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40 Mbps seems roughly 5x-10x the bitrate I'd expect for this kind of thing.

100 Gbit/s / 5000 KiB/s is 20000.

KiB = Kibibyte, not Kibibit

“Only” :)

Some sport events are live streamed by 10-20 million people in a single country. that means you need 3000-7000 such nodes to serve them.

It's almost as if on-demand video streaming isnt suitable for broadcasting live events.