Money is an answer to exploitation about as much

as

A slaver feeding their slaves is an answer to slavery.

Just because you get something in exchange, doesn't mean that there's no power imbalance, the exploitation doesn't exist, and the people with less power don't actually have few alternatives to survive.

If you're arguing for: "they should be paid more!" Because currently the pay is unfair and doesn't take into account potential long term damage, that's fair... But it's not a realistic solution (how do you unionize gig workers? Because at the end of the day, people on OF have more in common with the gig economy than with porn actors of yore)