My interpretation is that the demand comes from the pornography companies themselves. E.g. trafficked people forced to make pornography.
I get the trafficking for prostitution, but is trafficking for porn actually a thing? Would it even make money?
- https://www.nytimes.com/2020/12/04/opinion/sunday/pornhub-ra...
- https://nypost.com/2021/02/12/pornhub-mindgeek-hosted-rape-v...
- https://exoduscry.com/articles/a-survivor-of-teen-porn-traff...
Not every pornographic video is non-consensual or necessarily involves exploitation, but the reality is that there is no way for the average consumer of pornography to know which is which.