If Ariel does, they will be breaking a couple of data protection laws and will be legally liable. The person or people who obtained the data could also face penalties under data protection law. The details will all be on the data protection threads after the intern leaks - it’s a big deal taking customer data.
I also agree that MNHQ need to be very firm about this and say that this topic gets the same moderation as anything else. Threats (not that I’ve ever seen one) and violence and hatred get modded. They always have, and people do report off colour posts. The tone of debate here is robust but it's polite . Beyond that, they need to stop trying to engage or compromise. TRAs don’t want to compromise, they want MNs head on a plate. You don’t win with abusers who want to destroy you. You put a legal boundary down and you leave it there, and you disengage.