Big Food vs. the People

Free markets tend to produce monopolies. You know how economies of scale are a thing? That's another way of saying that small companies lose to large companies at scale. "Disruption" or "agility" is the only thing that small companies have going for them, but once the monopolist gets large enough they can just buy up any upstarts and keep the market all to themselves forever. This is why you require governments to periodically shake the snowglobe and restore markets to competitiveness... until the monopolist gets big enough that they just buy the government, anyway.

You seem to be assuming chains are good. I prefer the one location restaurant myself, but by definition they will never be the largest chain.

McDonald's might be the largest restaurant chain in Italy but that doesn't really mean much given how many small restaurants the country has with high quality food.