There's no difference between someone like visa shutting down processing for porn sites and your bitcoin exchange of choice refusing to pay out cash to porn stars. Porn models gotta eat, and last time I checked Costco doesn't accept bitcoin. Bitcoin can never be "truly free" from US control until it has it's own parallel economy, and that turned out to be a non-starter. And no, "local-bitcoins" is not a solution to that, because the last thing an online personality wants to do is meet up with a stranger who could plausibly discover who they are.