In 2012 Youtube did the Red Bull stratos live stream with 8m concurrent users. We're 12 years later, Netflix fucked up.
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E.g. the median engineer, excluding entry level/interns, at YouTube in 2012 was a literal genius at their niche or quite close to it.
Netflix simply can’t hire literal geniuses with mid six figure compensation packages in 2024 dollars anymore… though that may change with a more severe contraction.
The only reasonable way to scale something like this up is probably to... scale it up.
Sure, there are probably some generic lessons, but I bet that the pain points in Netflix's architecture (historically grown over more than a decade and optimized towards highly cacheable content) are very different from Youtube, which has ramped up live content gradually over as many years.
8m vs 60m. And not in 4K. Not a great choice for comparison.