Private security, PMCs, and private prisons all operate here.

These are necessarily a problem themselves in existing. They all become problems when they are granted privileges above others because they act as entities of the state.

Or the VOC

British East India Company

That is a state

Already.

Just off the top of my head, pepsi had one of the largest navies in the world at one point, and both coca-cola and nestle are known for hiring mercenaries to kill and threaten their own workers (union leaders and or striking workers). I don't doubt that's the very tiny tip of the corporate violence iceberg (beyond the inherent violence in slave or near slave labour).