Packages also carry a repo attribute, that the package manager automatically adds (and it's restricted to that package and dependencies that aren't available in the native repos only, and also restricted per-user).
An administrator can promote the package to per-system, as well as promoting the repos.
(That said, submission to native repos is preferred, but this allows development repos, as well as things inappropriate for native repos, without the Windows/macOS situation of per-app updaters.)
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