As someone who spent 10 years in the business trafficking is indeed rare. In my experience it is mostly through organized crime in LA, SF, and NYC.
Almost all Asian AAMPs are trafficked women. They are snuck in on ships and forced to work to pay their “debt”.
Outside of this women work in prostitution because they need money. A lot of people demonize this work saying how terrible it is, but the reality is an hours work is a days wages at a normal job. That’s very tempting.
Internet ads and online advertising got women off the streets and made things incredibly safer. Women could focus on screening clients instead of attracting them, increasing safety.