The CDN goes down and the app still starts, from a copy of each remote built into the binary. In a CDN launch, a remote that fails to load drops to its own copy while the other stays on the CDN, and Try again finally retries.
Every launch, the app asks the CDN which remote versions it may run. Then an operator ships a new one to an installed app with one directory and one line of JSON, and rolls it back the same way. Plus what Apple and Google permit, quoted from the current texts.
The remotes leave the dev server: built for production, signed at build time and served from a CDN that is a directory and a port. The registry sits in the middle, and one table says which changes still cost an app-store release.
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