That isn't monopolization. There are over 8000 active microbreweries in the US, and they haven't been put out of business by Anheuser Busch. In fact, Anheuser Busch has been scared of their growth for decades now. In 1979, when the wave of beer de-regulation started, there were only 90 breweries in the entire US.
There are almost 1M independent public-carrier trucking companies in the US. There are some 300,000 independent owner operators.
Your model is broken. De-regulation doesn't inevitably cause monopolization, there is something else that does that. In fact, you already alluded to it: network effects. Along with high fixed costs (which overly aggressive regulation contributes to), they're one of the defining features of a natural monopoly.
There are almost 1M independent public-carrier trucking companies in the US. There are some 300,000 independent owner operators.
Your model is broken. De-regulation doesn't inevitably cause monopolization, there is something else that does that. In fact, you already alluded to it: network effects. Along with high fixed costs (which overly aggressive regulation contributes to), they're one of the defining features of a natural monopoly.