But the reality (which was correctly identified by Adam Smith himself) is that the effort required to enter a market can sometimes be so high, that we practically end up with oligopolies, see mobile OSs. They require a network effect to make sense, so the entry cost is not just developing the product, but also to somehow convince basically every other player to consider you a target platform - which is a cyclical problem that you can't just bootstrap yourself into. Even Microsoft failed at it, even though they were paying hefty sums to companies for apps working on their OS.
I assure you it is not.