If the question is.....................

................"Should we worry about Jeff Bezos's growing empire?",
here is one answer that says "nope".   A wee excerpt:

Of course, all these fears are terribly dramatic and overblown, falling into the classic error that confuses corporate power with government power. While governments can use police and military forces to compel people to behave in a certain way, the only power corporations have in a free market is to offer to buy and sell goods. No one is obliged to do business with them, and they depend entirely on keeping their customers happy.

Of course the history majors amongst us might point out the occasional times when corporate power suborned governmental power.  And, its not like corporate power controls the media...oh, wait.  So, just in case:

More Amazon goodies here