What is the motive to producing non-consensual pornography? The risks are large: you're literally recording yourself committing a felony and publishing evidence of the crime to the world. Most porn production companies are looking to make a profit, not land themselves in jail. In the US, there's regulations to ensure all actors are of age and consented to recording [1].

1. https://www.law.cornell.edu/uscode/text/18/2257

What's the motive to producing pornography? Because it gets someone off.

People are investing in pornography production companies because they just like to get people off? No, the goal of production companies is to make money. The goal of the consumer is to get off, but the production company's goal absolutely is to money. As other commenters have pointed out [1] non-consensual pornography is indistinguishable to viewers from consensual pornography, so the risk of filming yourself commit rape and uploading evidence of the crime to the internet is not a decision I can see productions companies being keen on making.

For a very loose idea of "sex trafficking" that includes people deciding to work in porn to make ends meet - but at this point you could say your janitors are being trafficked because they wouldn't do their job if they didn't have to pay rent.

1. https://news.ycombinator.com/item?id=33028286

In the same way a bus company shouldn't be liable for transporting a wanted criminal a porn provider shouldn't be liable for nonconsensual porn.

They should take it down in a timely manner, which most sites do.