From an extensive Amazon reality check
"But as Amazon uses its powerful platform to bolster its private-label business, there is also debate in legal circles whether some of its activities could be viewed as monopolistic in nature. Some say Amazon could face a legal challenge akin in size and scope to when the Department of Justice two decades ago filed antitrust charges against Microsoft for bundling its own browser into its software, making it difficult for consumers to install a browser from Microsoft’s top competitor, Netscape. Microsoft lost that court battle.Amazon, the Brand Buster -- NYT
“I think there is a potential monopolization case against Amazon,” said Chris Sagers, an antitrust professor at the Cleveland-Marshall College of Law in Ohio. “The Amazon marketing people are geniuses. They’re brilliant,” Mr. Sagers said. “But if they are getting massive penetration in the market and preventing customers from buying products from their competitors? Well, it’s like they’re writing the plaintiff’s complaint for them.”"