[FD3SA]

Because most industries are consolidated by oligopolies. If newly formed, smaller and far more efficient companies begin to seriously threaten these oligopolies, they simply throw their weight around via acquisition, regulation or other quasi-legal means to destroy them.

Doesn't make for an exciting and optimistic story, but it is what it is. Pure capitalism is just as impossible as pure socialism, due to the exact same moral hazards. Human beings tend to use power to leverage their advantages in any way imaginable, regardless of the prevailing laws and ideologies of the day.