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Gmail users warned to opt out of new feature - what we know
(www.newsweek.com)
This is a most excellent place for technology news and articles.
I would opt out just in case. I remember using Adobe Acrobat at work and noticed they read every single PDF and generate a few comments about it even when you never asked them to. Meaning they‘re scanning through potentially confidential data. I have no doubts Google will do the same sooner or later.