At first, Carbiges found a few new cultivators that had just been added to the system network. However, all of them were kids who had just received their Divine Werdlem Stones and started to cultivate recently in the city. Their families tried to escape the city when the phenomenon took place, and they obviously brought their families with them.
However, soon, those new to the system ended, and Carbiges couldn't find anyone else who had been added to it in less than a year. In fact, looking for those up to a year was already quite an arduous task. In a city with over 50 million inhabitants, even if you counted only those who tried to leave it, there were tens of thousands who had been added in that time span outside the city.