The civilized world has universal health coverage, so the insurance thing isn’t really a problem except in one particular country. But the malicious release is definitely a problem.
I'm not sure that getting caught using such data would be sufficiently bad news to be not worth it.
I've been in Europe two decades and aside from health insurance being key to more than a few countries, private health insurance is relatively common in tandem with public health services.
Outside of those countries, it's still somewhat common to have private health insurance (not just dental), such as Mapfre or Regina Maria. Heck, even in Germany something like 1 out of 10 people have private health insurance (again, not just dental).