...
Your personal dat awill never be shared with third parties
Google Sheets usage
Additional Limits on Use of Your Google User Data: Notwithstanding anything else in this Privacy Policy, if you provide the App access to the following types of your Google data, the App's use of that data will be subject to these additional restrictions:
The App will only use this access to create Google sheets in your google account
The App will not use this Gmail data for serving advertisements.
The App will not allow humans to read this data unless we have your affirmative agreement for specific messages, doing so is necessary for security purposes such as investigating abuse, to comply with applicable law, or for the App's internal operations and even then only when the data have been aggregated and anonymized.