Any huge gang will definitely have a powerful source of funds. In addition to some small gangs, they will live by collecting some protection fees on the street.
it's like the Shenlong sect. Since the establishment of the northern evil sect, in order to have a stable source of funds, we have to open our own company, so that at least we have a stable income. In addition, there are some high-profit incomes such as smuggling arms and drug trafficking. We can have a regular company to make the veil, which will reduce many troubles.
the southern imperial army can have that kind of powerful military strength. Its capital income...