The question isn't "do we want Reddit users who want porn here?", but rather "do we want Reddit users who see no value in a space unless it's full of porn?".

There should absolute be spaces for sex workers, both online and in meatspace, but maybe the produce aisle still has value even if it's not surrounded by strippers. And maybe. People want to buy produce sometimes without seeing said strippers.

Now, whether there should be instances that are all sex workers or not is a different, and complicated, question. Sex work is often criminalized, and even the legal forms of it are highly scrutinized. Putting them all in a confined space makes it really easy for authorities who are looking to send a message to unilaterally shut down their infrastructure. We've seen it on the Fediverse before. They need some kind of smoke screen in order to be protected from the Delores Umbridges of the world. But that doesn't mean people who are unable or unwilling to handle the added stress and responsibility needtl to be the ones doing the screening.