At this moment in time, billions of people from all around the world mind their daily business without owning an ID, and being registered in any database. While this practice, most common in third world countries, allows people to stay off the grid, it can also cause numerous problems. Some of these include the inability to open bank accounts, travel to other countries, or even being treated in a hospital.
It is worth pointing out that fixing the issue via governmental implication isn't that easy, especially in certain regions where bureaucracy and high taxes make it almost impossible for a citizen to get their ID card.