Of course, even though people conducted businesses in the black market district without business licenses, it didn't necessarily mean everyone was blatantly ignoring and breaking the rules.
After all, the rules of Whispering Pearl City only stipulated that the sales of goods required a business license to ensure quality and reputation. As such, in the event of disputes, the city had the power to preside over such matters and offer fair judgment and punishments.
In other words, possessing a business license not only guaranteed the customer's trust but also protected the business against malicious customers who might seek to discredit products for the purpose of obtaining discounts, freebies, or other benefits.
However, such protection did not exist in the black market district, which was originally designated as a free trade area for disciples. No one could be punished for getting ripped off or scammed.