> That's not even remotely true (incidentally this would be illegal in the UK and a court would grant an injunction on publication under breach of confidence, precisely because it's such a shitty thing to do https://en.wikipedia.org/wiki/Breach_of_confidence_in_Englis...).

Yes but they would not charge you with theft. Which includes "the intention to permanently deprive"...

Copying someone's private data is not theft. That doesn't mean that it is morally or legally OK (it's not - it's another crime). It just means that theft is a specific crime based on taking fungible chattel with the intent to not give it back.