And this is true for food in general. Fast-food products aren't as good as the local foods you find in many mom and pop diners. It's the same power law distribution which isn't meritocratic.

It's like the butterfly effect. One accidental flap of its wings ends up having an enormous, exponential impact. That wing-flap isn't inherently superior to any other one, but it gets promoted by the laws of chaos. So McDonalds got promoted by the scam depicted in the movie The Founder, and Facebook got promoted by similar Machiavellian shenanigans. And society lives with the results of such amoral contests. We get to have McDonalds ads and Facebook shoved in our face, while all kinds of lesser competitors are ignored because they happened not to cross the threshold.