It's just now they can use their toys on their hometurf to defend themselves too.
WHY. That's the main point. People just do not understand just how goddam expensive military expenditures are. It's massively wasteful spending your not getting back. If you want the military to 'defend your turf' (from who?) bribe the military.
It's more a case of Shadowrun writers not understanding the economics of scale....and just economics in general. In the real world, mercenary companies are only profitable in places with massively destabilized military presences but those places don't have corporations operating there because well...It's massively unprofitable to operate there. The exceptions have monopolies on exclusive resources and they make money selling that stuff to stable places, not to themselves.
Your not arguing with me as much as just using motte and bailey tactics.
You bring up a real-life corporation, which as I mentioned makes all its profits selling to governments, which are the only things that can afford such massive expenditures because of taxes and inflation.
Shadowruns Corporations are effectively communist mini states which I believe is possibly the least effective and hardest to make profit and taxes government possible.