Comstar is DEAD. They were disarmed at the end of the Jihad. Their short-lived military resurgence was smacked down hard and led to the complete dismantling of even the civilian branches within the Republic. This resurgence was also completely unknown outside the Fortress. Outside the Fortress, the withered husk of corporate Comstar is rapidly going bankrupt despite selling off everything that wasn't nailed down.
The only notable use of C3i after the Jihad was when the Bears put it on a few prototypes whose only real action was to slaughter a bunch of Nova Cat civilians in the Second Bear-DC war. This led to Republic peacekeepers, and intense negotiations that culminated in Clan Ghost Bear voluntarily(and VERY permanently) eliminating all of their capacity to build or field C3i.
As much as the Manei Domini cyborgs, it seems that C3i is viewed as the single most 'Blakist' bit of technology out there. You have a realm with no friends, right next door to the Master's former backyard, deploy that stuff without the weight of a Bear-sized military to keep people back? You will be on everyone's shit list immediately, and there will be no shortage of major powers willing to be proactive about their displeasure.