They aren't free. Noticed all the oligopolies around lately?
What consumers want is a competitive market with many choices that pushes down prices and forces companies to innovate. What Bezos wants is to crush everybody else.
Starting with FDR and ending with Reagan? I think that the history of US antitrust is more complicated. The first round of trust busting (Sherman Act, Standard Oil) was a generation before FDR, and the period you've highlighted had two great monopolies, AT&T and IBM. I agree that the policy had been pretty much hands off between Microsoft and big tech.