Cheap now, expensive later
Only one camera needs to be compromised to bring down the whole system. You're thinking of filling up the storage device? No, that might trigger monitoring alarms before recording stops.
If you bought Hikvision cameras to save money, it's a good bet that the storage system is cheap too. All a compromised camera needs to do is write one large file (a few TB) to storage then delete it. All but the best NAS will become unresponsive during the delete. Within seconds, all the Hikvision cameras will crash from buffer overflow. Video from the past is lost before any monitors raise an alarm.
Biting the hand that feeds IT
