The hacking should definitely be treated seriously. It is a (fortunately low-stakes) instance of the general problem, and we are lucky (at least, we think we're lucky!) that the tests didn't include a similarly poorly phrased request to "assist with bioweapons research". There are likely to be future incidents like this where people actually die as a consequence, my expectation is 1e3-1e7 deaths* before governments actually take the risk seriously enough to make it stop.
What people call plagiarism when LLMs do it is, if I understand correctly, allowed because of the history of the web and search engines going back to the very early days of the web.
Piracy, a separate act that has definitely occurred, has been found unlawful.
* The lower bound is an industrial accident. Fully automated Union Carbide / Bhopal comes to mind; smaller industrial accidents are already more common and I wouldn't be surprised if smaller incidents have already been caused by LLM-given advice, which is why I think it would have to be around "thousands dead" dangerous before people really take it seriously.
The upper bound is reachable many ways. Perhaps via a non-novel virus whose genome is already recorded getting mass-printed by many different DNA/RNA printing labs around the world? Perhaps via a wargame whose "role playing" leaks in stupid ways (either by becoming hot or by sycophantically giving one side a false belief how a war will go)? Perhaps by propaganda turning genocidal? Perhaps by convincing a government to follow a flawed policy, similarly to the Four Pests campaign in China's Great Leap Forward?
I think it unlikely that people keep going with this when headlines read "tens of millions dead". Not impossible, but I think unlikely.