I think the operant phrase is “policy violations.” I’ve never heard that associated with anything but breaking a corporate rule: talking to the media unauthorized, leaking, harassment, etc.

Do you think that will sit well with a potential future employer regardless?

Said person could go back to working at Google anytime, likely. I don't think he needs to worry about covering for his reputation on this matter.

I dunno man, if I had a spare $300-$600k/year lying around I'd love to have this guy work for me even if he is a whiny smart aleck