Can you give an example of the sort of regulation a social media site should need to follow which Amazon should be exempt from? Or the sort of rule that should bind reddit and Facebook but not Amazon?

A better question is what sort of legislation should apply to every website on the planet, without exception. Because that’s what the current definition does, makes the law so broad as to be pointless. Why are laws being passed that affect every website, when the problem is a few very massive websites.