Amazon keeps reminding us that it's the most dangerous company in tech (AMZN)

There's a great part at the beginning of the movie "Raiders of the Lost Ark," where, in a moment of triumph, the villainous Belloq gloats to Indiana Jones that "again we see there is nothing you can possess which I cannot take away."
If I were Amazon CEO Jeff Bezos, I would get this quote inscribed on a wall plaque in my office. 
That's not to imply in any way that Bezos is a villain. But to his competitors, the Amazon CEO and founder is proving frustratingly adept at eating into