KEY POINTS
  • An NYU professor says the internet's "Four Horsemen" face competitive threats and argues their survival isn't assured.
  • It will be a battle of the giants, with all four pitted against each other.
  • Amazon could shed its web services business to keep ahead of regulators.

NYU Professor Scott Galloway says despite the awesome power of what he calls the Four Horsemen — Amazon, Apple, Facebook and Google — their survival isn't assured, especially given the competition they face with one another.

Galloway's new book, "The Four: The Hidden DNA of Amazon, Apple, Facebook, and Google," out today, is no fawning tribute, criticizing the Four Horseman on taxes, privacy and jobs.