This is one of the main reasons I am so highly confused why Netflix is so melded with AWS. When Netflix more or less made itself 100% AWS a year or two back, I was genuinely baffled.
But it isn't.
Netflix core service (video streaming) runs entirely on hardware they produce that runs in their own datacenters and embedded in ISPs. Billing, account management, video transcoding, etc. happen in AWS, but all that stuff can go down and customers don't get that upset.
Spool up hundreds of servers when they need to get a new title out, and buy them at cheapish rates is pretty much what the cloud was built for.