Arguably most of the tech is off the shelf. They won't be using their own server hardware, networking gear, peering agreements, or content delivery network, and

Arguably most of the tech is off the shelf. They won't be using their own server hardware, networking gear, peering agreements, or content delivery network, and will also likely be buying the video processing, database, data warehousing, workflows and pipelines, etc. Then they'll be outsourcing payment processing, potentially identity, customer support tooling too. What's left? Apps, which are branding-heavy, and where companies want to own the UX and a backend which amounts to a CRUD app and is cheap to build. Yes the apps from these places suck, but they're the tip of the iceberg, built cheaply because the companies aren't tech companies and are buying COTS. Rarely do end user experiences get white-labelled in these sorts of cases.