Excellent question! Indeed, the service-name.project-id.appspot.com like addresses should continue being accessible. You asked whether it's possible to hide the back-end microservices from the public. A custom domain would do just that, as the public is not normally aware of your project ID and similar details. In any case, the "extra layer" for the back-end services is normally considered safe enough. You should not have to worry and hide addresses. It may be worthwhile mentioning that hidden addresses can be guessed or inferred somehow. Hiding is not considered safe enough.
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