Hosting an entire native app on the smartphone's developing company servers?

Are there some native applications which doesn’t need to be hosted in a server on some hosting platform, so that the entire app will be “hosted” in the smartphone producers’ servers (like the Apple’s or Google’s servers)?

I ask this since I’ve heard that at least some parts of native apps need to be hosted externally, in a private server on a a privately hired hosting platform (like DigitalOcean for that matter), though I’m not sure how accurate that is.

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