Google's auto-delete tools have been deemed useless. Google since quite sometime is criticized for collecting user data through web searches and locations. However, with its new privacy tool it seems to have changed the game. Read more at fastcompany.com
Google boasted that its new privacy feature provides users' with the ability to manually delete data through Google's activity pages. However, the feature seems of no use since by the time it becomes active most of the data seems to be already extracted by Google.
The longer the retention window, the more easy it is for Google to ensure training to their machine learning models.