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First off, I would always remember the maxim that the internet is NEVER private. Secondly, yeah, I'm sure that Google's systems data mine your emails looking for keywords for targeted advertising. So what? It isn't as if there is an army of Google creepers actually sitting in cubes going over your emails - it isn't actual people doing it. Plus you can opt out of it anyway, by simply clicking the appropriately named "opt out" button in your Google ad preferences. I'm not saying Google is the greatest company ever, but let's be fair.
Third, if you store things in Microsoft's cloud that they don't agree with, they will delete it. You know that Samsung commercial where the dad is about to go on a trip, and his wife shares a video that he "probably shouldn't look at on the plane?" Well, if he stores it in Microsoft's cloud, they may delete it as pornography. Whose Scrooge now, Microsoft? An uptight, judgmental, conservative prudish Scrooge? Yeah, thought so.