this is essentially the story of capitalism as it always results in monopoly concentration and the development of industry cartels. before tech it was oil, before oil it was rubber and tobbaco.
Modern capitalist liberal democracies have theoretically strong frameworks and powers for regulating and dismantling cartels though. The real story is that politicians and bureaucrats in government become corrupted by them and fail to act for the good of the people.
And that is the story of humanity, not any particular classification of society and governance.
https://en.wikipedia.org/wiki/State_monopoly_capitalism