This was the reason I stopped consuming it. I am not against porn, I like it, but verifying it is basically impossible. The issues usually boil down to money, same as usual.
Could be someone being forced by an individual.
Could be someone being forced by society (sex work as only way to afford college/healthcare/feeding a kid etc. even though the person feels being destroyed by it).
Could be private recordings posted as revenge.
You can’t really know.
Of course that’s a problem with other professions too, but all that can be done under capitalism is harm reduction. Similar to not buying from Nestle.

I just tried to think of what I can get absolutely ethically. Nothing. Even when thinking of vegetables directly from a farmer, dig in, and pesticides. How do they affect the environment, how were they produced, what happens to packaging. Nothing is 100% ethical. All I can do is try to avoid the worst or unnecessary.