Even with a strange world law, the violators who were punished with a slave seal were not a common occurrence that happened every day.
With a total world population of no less than ten billion people, the incident where someone received the slave seal by the world law usually only happened about twice a week with a variety of perpetrators. It could be just one person or a whole group of people.
The Slave Market also had their Hunter Association capture the lawbreakers and violators who were punished with a slave seal.
Consisting of many powerful members, the Slave Market was also backed up by almost all major and minor forces in the entire world. Since the punishment was a part of world law, everyone obviously would uphold it. Once they detected the wild slave seal's signal, they would hunt down their targets like ferocious beasts.