But the whole point is that in this case the money is not accumulated. Lots of different companies are each spending a lot of money in the hopes that they will be the last standing, at which point they will get to accumulate the money.

It's possible that if one company does end up with a monopoly, they will treat their employees better. Because then they will finally be able to charge higher prices to the customers without losing those customers to the other more exploitative businesses.