TINSTAAFM. There is no such thing as a free market under capitalism, as the first winners - which there are, even in a perfectly free market - will put their resources into making it not-free, as we're seeing here. These advantages accumulate and you end up with a few massive monopolies which the market exerts little control over. Not zero, but little, much less than most economists claimed for close to a century.
Keeping a market free would require magnitudes more regulation than right now - the opposite of what free market proponents advocate for.
Given this is obvious to mere mortals like us, how do economists defend the walmartization of every market? "It's working, don't fckit up", or "we're getting our bag, get yours"?
There isn't one adult who looks at this massive centralization and sees that it goes against the very principle of the thing?