It doesn't address that because it doesn't make that argument, in that way. One of its starting axioms is that economy is a positive sum game. In the case of your statement, it might argue that (in the very general sense) money makes more money in a positive sum way -- more total wealth in the economy. Then to the latter it merely says that business that are better at making money (and generally, wealth) get to out compete those that don't. Its premise is it optimizes for wealth creation of the entire economy. I think that's the place to take the argument -- either that you fundamentally disagree with that premise or some outcome of it.
> It basically feels like the capitalism starts off from fairly-level playing field
Historically I don't think so. I"m not expert but read a lot and I'm currently under the impression that economies were historically locked down by government or tightly coupled government / mercantile entities.
WWII was a great leveling of the playing field. There are many times in history when Gini coefficients dropped precipitously. All the evidence points to the fact that wealth tends to accumulate in capitalist economies until crises or government intervention prevents it.
On the other hand I understand the principle that money makes more money (the principle of investment and ROI), and I don't see how "competitive market" tackles this.
It basically feels like the capitalism starts off from fairly-level playing field, but over time becomes more and more unstable, the gap ever-widening. We have already seen it fall (at the beginning of communist regimes), and I'm afraid we'll see it fall again.
That's a pessimist view, which I hope won't turn out to be true, but I'd be interested in exploring alternatives.