well, if u think about it, netflix doesnt really do live. its all edge caching. so the live stream is not cached and thats why ISPs falling over from rhe sudden demand.
A lot of ISPs don’t engineer their networks for this sort of sudden burst of traffic, especially from sources like Netflix which are generally fairly constant. I’ll have to check the graphs later but at the start of the live broadcast the company I work for was seeing almost double the usual traffic across the Netflix caches.