I agree that the current state of Amazon's retail goods is not a monopoly. We will see if that remains true in 10 years.

Currently Microsoft does not have a monopoly on computer OS. They have practically no stake in mobile computers (smart phones). Mac has a decent share of desktop/laptop usage. Any claim that MacOS is "limiting in what programs it can run" is a 10 year old argument or so one sided (Windows is also limiting in what programs it can run....). The Microsoft of 20 years ago _did_ have a monopoly on computer OS.