I've only seen guidelines and articles about how the Google App signing works, how it benefits you and that it is permanent once you've opt in. But I can't find any proof that if you opt out once, will you be able to use it in the future?
Example: I'm trying to release an app, but I don't want to opt-in right now. In the future, I might. If I do change my mind, will I be able to opt-in again?
The thing about Google App Signing is that the keystore certificate are stored on google servers and you don't have access to them directly.
For example, every time you need to update an app on the play store the app must be signed with the same certificate, so if you opt-in you cannot opt-out since the certificate stays with google and there is no option to download it at this time
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