Because "free market" does not exist. In "free market" you will end up with few majors owning everything else and controlling people's lives. We have various regulations that among the other protect small companies to a point and are trying to keep the huge ones in check. Things are slowly deteriorating lately in favor of big corps as they have government in their pockets but hopefully it is not yet irreversible. There is much more to discuss about "free market" and that naive "survival of the fittest" look at it but I am in no mood and am not qualified to write essays about the subject.
Which is why if you read the second part about my comment above, free markets are regulated. It's a no true scotsman to appeal to the purity of free market semantics when nobody else is using language limited to the literal definition.
