Thanks for reaching out on the DevForum! When an app is public on our Marketplace it is accesible to the public, which means other Zoom accounts will be able to authorize this app. If you would like for an app to be used only by users within your Zoom account there is no need to make this app public and go through our review process.
Let me know if there is anything else I can clarify in this.
Edit: Another publication option we offer is Unlisted. With this option, only external accounts that receive an invitation or have the direct link can access and authorize the app. This provides a more controlled, exclusive experience, ensuring that only the people you intend to have access are able to use it.