I noticed Amazon has stopped informing you what you actually purchased in their confirmation emails (though the emails still have other purchase suggestions in them). I'm guessing that might be partially to prevent the info from being conveyed to Google in Gmail.
> I can almost guarantee it's to get you to click back into the store for re-engagement.
Yes. I saw that while in China. I would get push notifications from Gmail and I was able to know what was the mail about without access to Gmail. But, for Facebook I would only get "You got a message". And that was totally unhelpful. Now, I knew that I had a message that I was not able to access too. Seriously infuriating.