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Now, Google is enabling the auto-delete feature by default for new users. So, if new users haven’t taken any action to review and delete their data, Google will automatically delete it after a span of 18 months. Also, if you are enabling the option for the first time from the My Activity section, it will set the auto-deletion period to 18 months.
If you’ve already enabled it, Google won’t change the settings, but it will remind you about the new data retention policy via in-app notifications and emails. Moreover, Google is also extending the new policy to YouTube “where auto-delete will be set to 36 months by default if you create a new account or turn on your YouTube History for the first time.”