The amount of traffic that must go through the docker hub, must be insane, the images go into the gigabytes and everyone expects it to be super fast.
Cloudflare is one of the few companies who can handle that for relatively cheap, Docker could not just "run their own" and have it even be compareable.
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One of few doesn’t mean they’re the only ones. Imagine how much easier it would be for CDNs to have revenue if they didn’t have to battle Cloudflare’s obscenely broad portfolio