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Netflix is well-known for running much of their infrastructure in AWS. What infrastructure do they not run in AWS? I'm aware of their CDN, which is the core of their business, and which they manage in-house. Are there other parts of the Netflix service that they self-host?

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Not anymore, no. The billing was the last big thing to move.

Everything except the CDN is on AWS (unless they moved something back to the datacenter since I left 1.5 years ago, but that's unlikely and I probably would have heard about it).

It's pretty amazing Open Connect[1] doesn't get as much "fan fare" as Netflix use of AWS. This is arguably the core of what they do ( push tons of bits to the end user ), and something the cloud could not do for them.

[1] https://openconnect.netflix.com/en/

I am curious if the other streaming video providers are doing something on the same principle to the Netflix Open Connect.

Just by assuming that 5-10% of their actual Netflix video traffic gets served from AWS and the rest gets served from the Open Connect servers, it's probable that any other competitor (except Amazon Video) would see huge savings with a similar implementation.

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