Whenever you download and install an app on your smartphone, it grants access to your Google Account. These third-party apps can use your Google account and all the information whenever they want. Even when you uninstall the app, it still has access to your Google account. Hence, if you want to keep your Google account safe and secure, then you must revoke the access of your Google account from these third-party applications.

Source:- How to Revoke Google Account Access from Third-Party Apps

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