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I receive a lot of scam emails from Google Docs - ie random users 'sharing' Google Docs with me that are either ads or viruses or both.

I got one of these once. Google does run spam classifiers for docs and you can report them as spam: https://support.google.com/drive/answer/13305033

Interesting I received a flood of these maybe 6 months ago. It never happened before and it never happened again.