Anarcho-capitalism is an oxymoron.

As Wikipedia succinctly (and loosely) put it, anarchy is society without rulers - a society without authority or hierarchy. Authority and hierarchy would definitely be present in anarcho-capitalism. Wealth, power, and influence would likely still concentrate into the hands of the few (i.e. rulers).

It's essentially just capitalism without an official state and practices like regulation or reigning in corporate power. Corporations would function effectively as states in such a scenario.